[llvm] [llvm-mca] Abort on parse error without -skip-unsupported-instructions (PR #90474)

[Patrick Holland via llvm-commits]

holland11 wrote:

Just read through the whole thread and I agree with the consensus up to this point. 

> * In aid of keeping things simple we have one flag, `-skip-unsupported-instructions`, and it takes `no-sched-info`, `parse-error` and `all`. If it becomes desirable to add more distinction it should be possible to add other values to this option.
> 
> * The flag describes what it is doing, which is skipping over instructions on the input.

Implementing it like this seems completely reasonable to me. Thanks for the effort. 


https://github.com/llvm/llvm-project/pull/90474