Update FunctionContext::Inserter::InsertHelper for llvm changes (#4069)

The interface has changed upstream:


https://github.com/llvm/llvm-project/commit/80f881485accb020345ee7e1c4c3151ec55ce590

MODULE.bazel

@@ -116,8 +116,8 @@ bazel_dep(name = "zstd", version = "1.5.6", repo_name = "llvm_zstd")
 
 # We pin to specific upstream commits and try to track top-of-tree reasonably
 # closely rather than pinning to a specific release.
-# HEAD as of 2024-05-17.
-llvm_project_version = "a68d20e986053ec571223a9f3ead3e146a27dc82"
+# HEAD as of 2024-06-20.
+llvm_project_version = "80f881485accb020345ee7e1c4c3151ec55ce590"
 
 # Load a repository for the raw llvm-project, pre-overlay.
 http_archive(
@@ -128,7 +128,7 @@ http_archive(
         "@carbon//bazel/llvm_project:0001_Patch_for_mallinfo2_when_using_Bazel_build_system.patch",
         "@carbon//bazel/llvm_project:0002_Added_Bazel_build_for_compiler_rt_fuzzer.patch",
     ],
-    sha256 = "4c53512522cfd625a75aa7f201e6932f18ebf3fbe8ee89e05883c3d30ca935ac",
+    sha256 = "3216d56b308d420170d6284d04560175b56fd56065a7442f32b732c606e77367",
     strip_prefix = "llvm-project-{0}".format(llvm_project_version),
     urls = ["https://github.com/llvm/llvm-project/archive/{0}.tar.gz".format(llvm_project_version)],
 )

toolchain/lower/function_context.cpp

@@ -152,7 +152,7 @@ auto FunctionContext::CopyObject(SemIR::TypeId type_id, SemIR::InstId source_id,
 }
 
 auto FunctionContext::Inserter::InsertHelper(
-    llvm::Instruction* inst, const llvm::Twine& name, llvm::BasicBlock* block,
+    llvm::Instruction* inst, const llvm::Twine& name,
     llvm::BasicBlock::iterator insert_pt) const -> void {
   llvm::StringRef base_name;
   llvm::StringRef separator;
@@ -164,7 +164,7 @@ auto FunctionContext::Inserter::InsertHelper(
   }
 
   IRBuilderDefaultInserter::InsertHelper(inst, base_name + separator + name,
-                                         block, insert_pt);
+                                         insert_pt);
 }
 
 }  // namespace Carbon::Lower

toolchain/lower/function_context.h

@@ -115,7 +115,6 @@ class FunctionContext {
 
    private:
     auto InsertHelper(llvm::Instruction* inst, const llvm::Twine& name,
-                      llvm::BasicBlock* block,
                       llvm::BasicBlock::iterator insert_pt) const
         -> void override;