[clang] [clang-tools-extra] [clang][AST] Fix StmtProfile handling of GCCAsmStmt asm strings and clobbers (PR #201481)

[Chuanqi Xu via cfe-commits]

ChuanqiXu9 wrote:

> I'm not much familiar with clang AST Visitor testing, but is there any unit or other tests for `clang/lib/AST`? If so, we better make test there as well. Apart from this, lgtm with nit

It is fine generally if we have lit test. But I didn't notice the lit test doesn't belong to clang itself. Yeah, it is better to have a lit test under clang. We wrote unit tests less than lit test. 

https://github.com/llvm/llvm-project/pull/201481