[clang] [clang][CodeGen][UBSan] Fixing shift-exponent generation for _BitInt (PR #80515)

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``````````bash
git-clang-format --diff e296cedcd686e24fee75756185669f1bb3b47fdd c3be3ebd7a8ae57d319eedbb97ab85324c814db2 -- clang/test/CodeGen/ubsan-shift-bitint.c clang/lib/CodeGen/CGExprScalar.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/CodeGen/CGExprScalar.cpp b/clang/lib/CodeGen/CGExprScalar.cpp
index f08fb8d4e3..df8f71cf1d 100644
--- a/clang/lib/CodeGen/CGExprScalar.cpp
+++ b/clang/lib/CodeGen/CGExprScalar.cpp
@@ -774,7 +774,7 @@ public:
   void EmitUndefinedBehaviorIntegerDivAndRemCheck(const BinOpInfo &Ops,
                                                   llvm::Value *Zero,bool isDiv);
   // Common helper for getting how wide LHS of shift is.
-  static Value *GetMaximumShiftAmount(Value* LHS,Value* RHS);
+  static Value *GetMaximumShiftAmount(Value *LHS, Value *RHS);
 
   // Used for shifting constraints for OpenCL, do mask for powers of 2, URem for
   // non powers of two.
@@ -4115,7 +4115,7 @@ Value *ScalarExprEmitter::EmitSub(const BinOpInfo &op) {
   return Builder.CreateExactSDiv(diffInChars, divisor, "sub.ptr.div");
 }
 
-Value *ScalarExprEmitter::GetMaximumShiftAmount(Value* LHS,Value* RHS) {
+Value *ScalarExprEmitter::GetMaximumShiftAmount(Value *LHS, Value *RHS) {
   llvm::IntegerType *Ty;
   if (llvm::VectorType *VT = dyn_cast<llvm::VectorType>(LHS->getType()))
     Ty = cast<llvm::IntegerType>(VT->getElementType());
@@ -4141,7 +4141,7 @@ Value *ScalarExprEmitter::ConstrainShiftValue(Value *LHS, Value *RHS,
     Ty = cast<llvm::IntegerType>(LHS->getType());
 
   if (llvm::isPowerOf2_64(Ty->getBitWidth()))
-        return Builder.CreateAnd(RHS, GetMaximumShiftAmount(LHS, RHS), Name);
+    return Builder.CreateAnd(RHS, GetMaximumShiftAmount(LHS, RHS), Name);
 
   return Builder.CreateURem(
       RHS, llvm::ConstantInt::get(RHS->getType(), Ty->getBitWidth()), Name);

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https://github.com/llvm/llvm-project/pull/80515