[clang] [Clang] Support generic bit counting builtins on fixed boolean vectors (PR #154203)

[Joseph Huber via cfe-commits]

================
@@ -13455,6 +13455,10 @@ bool IntExprEvaluator::VisitBuiltinCallExpr(const 
CallExpr *E,
   case Builtin::BI__lzcnt16: // Microsoft variants of count leading-zeroes
   case Builtin::BI__lzcnt:
   case Builtin::BI__lzcnt64: {
+    //  TODO: Handle boolean vectors in constexpr contexts.
+    if (E->getArg(0)->getType()->isExtVectorBoolType())
+      return false;
----------------
jhuber6 wrote:

I'll give it a shot, thanks.

https://github.com/llvm/llvm-project/pull/154203
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