[NFC] Minor fix to tryEmitAbstract type in EmitCXXNewAllocSize (#123433) In EmitCXXNewAllocSize, when handling a constant array size, we were calling tryEmitAbstract with the type of the object being allocated rather than the expected type of the array size. This worked out because the allocated type was always a pointer and tryEmitAbstract only ends up using the size of the type to extend or truncate the constant, and in this case the destination type should be size_t, which is usually the same width as the pointer. This change fixes the type, but it makes no functional difference with the current constant emitter implementation.
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