Refactor Bazel toolchain to use rules_cc action groups (#7086)

Rather than defining our own action groups, work to re-use the
`rules_cc` ones, as they are (much) more comprehensive. Also, completely
eliminate the `codegen` action group as it was not well used. For
example, `-march` flags and `-O` flags change the preprocessor macros
defined. There isn't a really great "codegen" heuristic, so just pass
those flags to all compiles which is simpler anyways.

I'm tempted to do the same with preprocessor actions, but maybe it makes
sense to have that one stay separate.

Assisted-by: Antigravity with Gemini

bazel/cc_toolchains/cc_toolchain_cpp_features.bzl

@@ -4,7 +4,7 @@
 
 """Definitions of general C++ `cc_toolchain_config` features."""
 
-load("@rules_cc//cc:action_names.bzl", "ACTION_NAMES")
+load("@rules_cc//cc:action_names.bzl", "ACTION_NAMES", "ACTION_NAME_GROUPS")
 load(
     "@rules_cc//cc:cc_toolchain_config_lib.bzl",
     "feature",
@@ -14,10 +14,6 @@ load(
 )
 load(
     ":cc_toolchain_actions.bzl",
-    "all_compile_actions",
-    "all_cpp_compile_actions",
-    "all_link_actions",
-    "codegen_compile_actions",
     "preprocessor_compile_actions",
 )
 
@@ -26,7 +22,7 @@ clang_feature = feature(
     enabled = True,
     flag_sets = [
         flag_set(
-            actions = all_compile_actions + all_link_actions,
+            actions = ACTION_NAME_GROUPS.all_cc_compile_actions + ACTION_NAME_GROUPS.all_cc_link_actions,
             flag_groups = [
                 flag_group(flags = [
                     "-no-canonical-prefixes",
@@ -39,7 +35,7 @@ clang_feature = feature(
             ],
         ),
         flag_set(
-            actions = all_compile_actions,
+            actions = ACTION_NAME_GROUPS.all_cc_compile_actions,
             flag_groups = [
                 flag_group(flags = [
                     # Compile actions shouldn't link anything.
@@ -68,20 +64,20 @@ clang_feature = feature(
         ),
         flag_set(
             # Flags specific to compiling C++ sources.
-            actions = all_cpp_compile_actions,
+            actions = ACTION_NAME_GROUPS.all_cpp_compile_actions,
             flag_groups = [flag_group(flags = [
                 "-std=c++20",
             ])],
         ),
         flag_set(
-            actions = codegen_compile_actions,
+            actions = ACTION_NAME_GROUPS.all_cc_compile_actions,
             flag_groups = [flag_group(flags = [
                 "-ffunction-sections",
                 "-fdata-sections",
             ])],
         ),
         flag_set(
-            actions = codegen_compile_actions,
+            actions = ACTION_NAME_GROUPS.all_cc_compile_actions,
             flag_groups = [flag_group(
                 expand_if_available = "pic",
                 flags = ["-fPIC"],
@@ -129,7 +125,7 @@ clang_feature = feature(
             flag_groups = [flag_group(flags = ["-shared"])],
         ),
         flag_set(
-            actions = all_link_actions,
+            actions = ACTION_NAME_GROUPS.all_cc_link_actions,
             flag_groups = [
                 flag_group(
                     expand_if_available = "strip_debug_symbols",
@@ -151,7 +147,7 @@ clang_feature = feature(
             ],
         ),
         flag_set(
-            actions = all_link_actions,
+            actions = ACTION_NAME_GROUPS.all_cc_link_actions,
             flag_groups = [
                 flag_group(
                     flags = [
@@ -199,7 +195,7 @@ clang_warnings_feature = feature(
     name = "clang_warnings",
     enabled = True,
     flag_sets = [flag_set(
-        actions = all_compile_actions,
+        actions = ACTION_NAME_GROUPS.all_cc_compile_actions,
         flag_groups = [flag_group(flags = [
             "-Werror",
             "-Wall",
@@ -263,7 +259,7 @@ def libcxx_feature(llvm_bindir = None, clang_bindir = None):
         enabled = True,
         flag_sets = [
             flag_set(
-                actions = all_cpp_compile_actions + all_link_actions,
+                actions = ACTION_NAME_GROUPS.all_cpp_compile_actions + ACTION_NAME_GROUPS.all_cc_link_actions,
                 flag_groups = [flag_group(flags = [
                     "-stdlib=libc++",
                 ])],
@@ -273,17 +269,17 @@ def libcxx_feature(llvm_bindir = None, clang_bindir = None):
                 ],
             ),
             flag_set(
-                actions = all_cpp_compile_actions,
+                actions = ACTION_NAME_GROUPS.all_cpp_compile_actions,
                 flag_groups = [flag_group(flags = _libcpp_debug_flags)],
                 with_features = [with_feature_set(not_features = ["opt"])],
             ),
             flag_set(
-                actions = all_cpp_compile_actions,
+                actions = ACTION_NAME_GROUPS.all_cpp_compile_actions,
                 flag_groups = [flag_group(flags = _libcpp_release_flags)],
                 with_features = [with_feature_set(features = ["opt"])],
             ),
             flag_set(
-                actions = all_link_actions,
+                actions = ACTION_NAME_GROUPS.all_cc_link_actions,
                 flag_groups = [flag_group(flags = [
                     "-unwindlib=libunwind",
                 ])],
@@ -293,7 +289,7 @@ def libcxx_feature(llvm_bindir = None, clang_bindir = None):
                 ],
             ),
             flag_set(
-                actions = all_link_actions,
+                actions = ACTION_NAME_GROUPS.all_cc_link_actions,
                 flag_groups = [flag_group(flags = extra_link_flags + [
                     # Force linking the static libc++abi archive here. This
                     # *should* be linked automatically, but not every release of