[clang] [CIR] Add is_implicit to ReturnOp (PR #174832)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,c,h -- clang/lib/CIR/CodeGen/CIRGenFunction.cpp clang/lib/CIR/CodeGen/CIRGenFunction.h clang/test/CIR/CodeGen/basic.c clang/test/CIR/CodeGen/loop.cpp clang/test/CIR/CodeGen/member-functions.cpp clang/test/CIR/CodeGen/nullptr-init.cpp --diff_from_common_commit
``````````

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in a stack if you are using a stacked PR workflow. You can limit the results by
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/CIR/CodeGen/CIRGenFunction.cpp b/clang/lib/CIR/CodeGen/CIRGenFunction.cpp
index 48039747d..0447a11f0 100644
--- a/clang/lib/CIR/CodeGen/CIRGenFunction.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenFunction.cpp
@@ -352,7 +352,8 @@ void CIRGenFunction::LexicalScope::cleanup() {
   insertCleanupAndLeave(curBlock);
 }
 
-cir::ReturnOp CIRGenFunction::LexicalScope::emitReturn(mlir::Location loc, bool isImplicit) {
+cir::ReturnOp CIRGenFunction::LexicalScope::emitReturn(mlir::Location loc,
+                                                       bool isImplicit) {
   CIRGenBuilderTy &builder = cgf.getBuilder();
 
   // If we are on a coroutine, add the coro_end builtin call.

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https://github.com/llvm/llvm-project/pull/174832