[clang] [clang][AST][NFC] Add '[[fallthrough]]' to cases fall through (PR #85921)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang-codegen

Author: Ben Shi (benshi001)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/85921.diff


1 Files Affected:

- (modified) clang/lib/CodeGen/CGStmt.cpp (+1-1) 


``````````diff
diff --git a/clang/lib/CodeGen/CGStmt.cpp b/clang/lib/CodeGen/CGStmt.cpp
index 8898e3f22a7df6..7d7744bafb110e 100644
--- a/clang/lib/CodeGen/CGStmt.cpp
+++ b/clang/lib/CodeGen/CGStmt.cpp
@@ -160,7 +160,7 @@ void CodeGenFunction::EmitStmt(const Stmt *S, ArrayRef<const Attr *> Attrs) {
   case Stmt::ReturnStmtClass:  EmitReturnStmt(cast<ReturnStmt>(*S));      break;
 
   case Stmt::SwitchStmtClass:  EmitSwitchStmt(cast<SwitchStmt>(*S));      break;
-  case Stmt::GCCAsmStmtClass:  // Intentional fall-through.
+  case Stmt::GCCAsmStmtClass:  [[fallthrough]];
   case Stmt::MSAsmStmtClass:   EmitAsmStmt(cast<AsmStmt>(*S));            break;
   case Stmt::CoroutineBodyStmtClass:
     EmitCoroutineBody(cast<CoroutineBodyStmt>(*S));

``````````

</details>


https://github.com/llvm/llvm-project/pull/85921