[clang] [clang][Interp] Support arbitrary precision constants (PR #79747)

[Aaron Ballman via cfe-commits]

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@@ -228,6 +229,42 @@ void emit(Program &P, std::vector<std::byte> &Code, const Floating &Val,
   Val.serialize(Code.data() + ValPos);
 }
 
+template <>
+void emit(Program &P, std::vector<std::byte> &Code,
+          const IntegralAP<false> &Val, bool &Success) {
+  size_t Size = Val.bytesToSerialize();
+
+  if (Code.size() + Size > std::numeric_limits<unsigned>::max()) {
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AaronBallman wrote:

Because I was confused, that's why! (I was mistakenly thinking this was validating the value fit within range, but noooooo that's not what it's doing at all.)

https://github.com/llvm/llvm-project/pull/79747