[clang] [Clang] Add __builtin_bswapg (PR #162433)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff origin/main HEAD --extensions c,cpp -- clang/lib/AST/ByteCode/InterpBuiltin.cpp clang/lib/AST/ExprConstant.cpp clang/lib/CodeGen/CGBuiltin.cpp clang/lib/Sema/SemaChecking.cpp clang/test/AST/ByteCode/builtin-functions.cpp clang/test/CodeGen/builtins.c clang/test/Sema/constant-builtins-2.c clang/test/Sema/constant-builtins.c
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp
index 76308fe63..9e3334c08 100644
--- a/clang/lib/AST/ExprConstant.cpp
+++ b/clang/lib/AST/ExprConstant.cpp
@@ -14036,7 +14036,7 @@ bool IntExprEvaluator::VisitBuiltinCallExpr(const CallExpr *E,
       return false;
     if (Val.getBitWidth() == 8)
       return Success(Val, E);
-        
+
     return Success(Val.byteSwap(), E);
   }
 
diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
index 486fc8d08..80afa08f3 100644
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -3476,7 +3476,7 @@ Sema::CheckBuiltinFunctionCall(FunctionDecl *FDecl, unsigned BuiltinID,
   }
   case Builtin::BI__builtin_bswapg:
     if (BuiltinBswapg(*this, TheCall))
-        return ExprError();
+      return ExprError();
     break;
   case Builtin::BI__builtin_popcountg:
     if (BuiltinPopcountg(*this, TheCall))

``````````

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https://github.com/llvm/llvm-project/pull/162433