[clang] [ExprConstant] Handle shift overflow the same way as other kinds of overflow (PR #99579)

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


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``````````bash
git-clang-format --diff 49b2c30feb3730ccb1ba075dd37e68d47095bb23 1137011c51285b083cab6c15de670e64337d3de0 --extensions c,h,cpp -- clang/lib/AST/ExprConstant.cpp clang/lib/AST/Interp/Interp.h clang/test/AST/Interp/shifts.cpp clang/test/CXX/basic/basic.types/p10.cpp clang/test/Sema/constant-builtins-2.c clang/test/Sema/shift-count-negative.c clang/test/Sema/shift-count-overflow.c clang/test/Sema/shift-negative-value.c
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/AST/Interp/Interp.h b/clang/lib/AST/Interp/Interp.h
index 1b17db61d7..fa74e995ed 100644
--- a/clang/lib/AST/Interp/Interp.h
+++ b/clang/lib/AST/Interp/Interp.h
@@ -160,7 +160,8 @@ bool CheckShift(InterpState &S, CodePtr OpPC, const LT &LHS, const RT &RHS,
       S.CCEDiag(E, diag::note_constexpr_lshift_of_negative) << LHS.toAPSInt();
       if (!S.noteUndefinedBehavior())
         return false;
-    } else if (LHS.toUnsigned().countLeadingZeros() < static_cast<unsigned>(RHS)) {
+    } else if (LHS.toUnsigned().countLeadingZeros() <
+               static_cast<unsigned>(RHS)) {
       S.CCEDiag(E, diag::note_constexpr_lshift_discards);
       if (!S.noteUndefinedBehavior())
         return false;

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https://github.com/llvm/llvm-project/pull/99579