[clang] [HLSL] add IsLineVectorLayoutCompatible type trait (PR #113730)

[Helena Kotas via cfe-commits]

hekota wrote:

> If you are going to store `isHLSLLineVectorLayoutCompatibleType` on a declaration you need to modify addMember to analyze newly added members. Then move the IsLineVectorLayoutCompatibleType implementation from SemaHLSL to Type and use the bit on the record type decl instead of building flattened type list.

On the other hand, it is probably not worth caching the bit on the decl because it also needs to make sure the size is within limits, which would more involved to have on the decl than we'd probably like. 

https://github.com/llvm/llvm-project/pull/113730