[InstCombine] Replace getAllocatedType() with getAllocationSize() (#177435) Replace uses of getAllocatedType() with the more semantic getAllocationSize() method in the alloca dereferenceability check and zero-size alloca merging logic. This simplifies the code by: - Eliminating manual isArrayAllocation() checks (handled by getAllocationSize) - Eliminating superfluous isSized() checks (the verifier rejects them already) - Using TypeSize::isScalable() for scalable vector handling (before casting to uint64_t) - Using TypeSize::isZero() for zero-size checks Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
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