[clang] Add flag to opt out of wasm-opt (PR #95208)

[Sam Clegg via cfe-commits]

sbc100 wrote:

I think should never not be running wasm-opt when the linker is  wasm-component-ld.   Thats not going to work, at least not any time soon.

How to integrate wasm-opt into wasm-component-ld is a good question.  I imagine @alexcrichton has some ideas in that area.

https://github.com/llvm/llvm-project/pull/95208