[llvm] [Transforms] Allow non-regex Source in SymbolRewriter in case of using ExplicitRewriteDescriptor (PR #154319)

[Dmitry Vasilyev via llvm-commits]

slydiman wrote:

> There's one here https://github.com/llvm/llvm-project/tree/main/llvm/test/SymbolRewriter

Thanks. I have added the test. Please take a look.

https://github.com/llvm/llvm-project/pull/154319