[llvm] [Backend] Add clearSubtargetMap API for TargetMachine. (PR #112383)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> To parallelize llvm compilation for more efficient compilation time.

But I would expect you can use one machine for different compilations. Is the issue TargetOptions? 


https://github.com/llvm/llvm-project/pull/112383