[clang] [llvm] Support for assume directive : Parse & AST modules (PR #97535)

[Alexey Bataev via cfe-commits]

alexey-bataev wrote:

> In clang/lib/Sema/SemaOpenMP.cpp I have retained the marking of the inner regions of the associated statements with AssumeAttr. This will make the work in Codegen easier.

How it will make the codegen easier? It is better to try to avoid post-building attribute assignment, if possible. If possible to add attribute on the region build, better to do it.

https://github.com/llvm/llvm-project/pull/97535