[clang] [clang] Avoid memcopy for small structure with padding under -ftrivial-auto-var-init (PR #71677)

[Youngsuk Kim via cfe-commits]

JOE1994 wrote:

FYI, the following `clang` tests seem to fail after revision [fe5c360](https://github.com/llvm/llvm-project/commit/fe5c360a9aae61db37886c0c795c409b5129905f)
```
Failed Tests (2):
  Clang :: CodeGen/aapcs-align.cpp
  Clang :: CodeGen/aapcs64-align.cpp
```

https://github.com/llvm/llvm-project/pull/71677