[clang] [llvm] [clang/LLVM] Add flatten_deep attribute for depth-limited inlining (1/2) (PR #165777)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions c,h,cpp -- clang/test/CodeGen/attr-flatten-deep-cg.c clang/test/Sema/attr-flatten-deep.c clang/lib/CodeGen/CodeGenModule.cpp clang/lib/Sema/SemaDeclAttr.cpp llvm/include/llvm/AsmParser/LLParser.h llvm/include/llvm/Bitcode/LLVMBitCodes.h llvm/include/llvm/IR/Attributes.h llvm/lib/AsmParser/LLParser.cpp llvm/lib/Bitcode/Reader/BitcodeReader.cpp llvm/lib/Bitcode/Writer/BitcodeWriter.cpp llvm/lib/IR/Attributes.cpp llvm/lib/Transforms/Utils/CodeExtractor.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/AsmParser/LLParser.cpp b/llvm/lib/AsmParser/LLParser.cpp
index 1390d46dc..7265f2f1d 100644
--- a/llvm/lib/AsmParser/LLParser.cpp
+++ b/llvm/lib/AsmParser/LLParser.cpp
@@ -1625,8 +1625,7 @@ bool LLParser::parseEnumAttribute(Attribute::AttrKind Attr, AttrBuilder &B,
     if (InAttrGroup) {
       Lex.Lex();
       LocTy DepthLoc = Lex.getLoc();
-      if (parseToken(lltok::equal, "expected '=' here") ||
-          parseUInt64(Depth))
+      if (parseToken(lltok::equal, "expected '=' here") || parseUInt64(Depth))
         return true;
       if (!Depth)
         return error(DepthLoc, "flatten_deep depth must be non-zero");

``````````

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https://github.com/llvm/llvm-project/pull/165777