[clang] [clang][bytecode] Handle corner condition for sign negation (PR #176390)

[via cfe-commits]

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@@ -2888,7 +2888,9 @@ inline bool DoShift(InterpState &S, CodePtr OpPC, LT &LHS, RT &RHS,
     S.CCEDiag(Loc, diag::note_constexpr_negative_shift) << RHS.toAPSInt();
     if (!S.noteUndefinedBehavior())
       return false;
-    RHS = -RHS;
+
+    RHS = RHS.isMin() ? RT(APSInt::getMaxValue(RHS.bitWidth(), false)) : -RHS;
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hax0kartik wrote:

Nope, because [IntegralAp](https://github.com/llvm/llvm-project/blob/a0e0775d91859d6ca32efc5fb8644b6281e98593/clang/lib/AST/ByteCode/IntegralAP.h) class does not define a max method. 

https://github.com/llvm/llvm-project/pull/176390