[clang][StaticAnalyzer] Reduce MallocSizeofChecker false positives for layout-compatible types (#200253) When one operand is a record type and the other is a non-record type, treat them as compatible if they share the same size and the record's alignment satisfies the scalar's alignment. This suppresses warnings for patterns like `malloc(sizeof(std::atomic<int32_t>))` assigned to an `int32_t *` (or a wrapper struct with an identical layout), while still flagging genuinely mismatched types such as `long` vs `double` or unrelated struct pairs. rdar://177553628 --------- Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
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