[clang] [clang][Interp] IntegralAP zero-init (PR #68081)

[Aaron Ballman via cfe-commits]

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@@ -100,12 +100,13 @@ template <bool Signed> class IntegralAP final {
   }
   static IntegralAP from(const Boolean &B) {
     assert(false);
-    return IntegralAP::zero();
+    return IntegralAP::zero(1);
   }
 
-  static IntegralAP zero() {
-    assert(false);
-    return IntegralAP(0);
+  static IntegralAP zero(int32_t BitWidth) {
+    APSInt V =
+        APSInt(APInt(BitWidth, static_cast<int64_t>(0), Signed), !Signed);
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AaronBallman wrote:

Oh wow, that's... neat. The explicit cast is also fine, but perhaps should be to `uint64_t` to remove one more implicit conversion step.

https://github.com/llvm/llvm-project/pull/68081