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

[Baranov Victor via cfe-commits]

https://github.com/vbvictor commented:

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

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