Add CallAction to allow deferring calls (#7682)

Calls with template callee or args can now be deferred via an
InstAction. This allows code like this to check:

```carbon
import Cpp inline '''
template<typename T>
struct C {};
''';

fn F(generic T: type) {
  let unused c: Cpp.C(T) = Cpp.C(T).C();
}
```

toolchain/check/action.cpp

@@ -71,7 +71,8 @@ template <typename IdT>
   requires SemIR::Internal::IsIdKindType<IdT> &&
            SameAsOneOf<IdT, SemIR::IdAndKind::NoneType, SemIR::AbsoluteInstId,
                        SemIR::CallParamIndex, SemIR::NameId,
-                       SemIR::ElementIndex, SemIR::ClangDeclId>
+                       SemIR::ElementIndex, SemIR::ClangDeclId,
+                       SemIR::BoolValue>
 static auto OperandDependence(Context& /*context*/, IdT /*id*/)
     -> SemIR::ConstantDependence {
   return SemIR::ConstantDependence::None;
@@ -98,6 +99,12 @@ static auto OperandDependence(Context& context,
   return result;
 }
 
+static auto OperandDependence(Context& context,
+                              SemIR::MetaInstBlockId inst_block_id)
+    -> SemIR::ConstantDependence {
+  return OperandDependence(context, SemIR::InstBlockId{inst_block_id});
+}
+
 static auto OperandDependence(Context& context, SemIR::SpecificId specific_id)
     -> SemIR::ConstantDependence {
   auto specific = context.specifics().Get(specific_id);