[clang] [clang][analyzer] Correct SMT Layer for _BitInt cases refutations (PR #143310)

[Donát Nagy via cfe-commits]

================
@@ -601,8 +601,8 @@ class SMTConv {
     if (APSIntBitwidth == 1 && Ty.isNull()) {
       NewInt = Int.extend(Ctx.getTypeSize(Ctx.BoolTy));
       Ty = getAPSIntType(Ctx, NewInt);
-    } else if (!IsPower2(APSIntBitwidth) && !getAPSIntType(Ctx, Int).isNull()) {
-      Ty = getAPSIntType(Ctx, Int);
+    } else if (!llvm::isPowerOf2_32(APSIntBitwidth) &&
+               !getAPSIntType(Ctx, Int).isNull()) {
----------------
NagyDonat wrote:

In the condition `getAPSIntType(Ctx, Int)` is still needlessly complex -- you can write `Ty` instead of it.

https://github.com/llvm/llvm-project/pull/143310