[clang-tools-extra] [clangd] Show alignment for records and fields decls (PR #67213)

[via cfe-commits]

sr-tream wrote:

> I'm not an expert on ABI

I too. I use exists function `ASTContext::getTypeAlign` - it must work correctly, if other functions like `ASTContext::getTypeSizeInCharsIfKnown` return correct results, because `ASTContext::getTypeSizeInCharsIfKnown` returns size with paddings for align

https://github.com/llvm/llvm-project/pull/67213