[clang] [Clang] Fix a non-effective assertion (PR #81083)

[Shilei Tian via cfe-commits]

================
@@ -5908,7 +5908,7 @@ RValue CodeGenFunction::EmitBuiltinExpr(const GlobalDecl 
GD, unsigned BuiltinID,
           }
         }
 
-        assert(PTy->canLosslesslyBitCastTo(FTy->getParamType(i)) &&
+        assert(ArgValue->getType()->canLosslesslyBitCastTo(PTy) &&
----------------
shiltian wrote:

`canLosslesslyBitCastTo` is supposed to be stricter than `castIsValid` but it 
looks too conservative. For example, it doesn't allow bitcast between `float` 
and `int`.

https://github.com/llvm/llvm-project/pull/81083
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