shenhan added a comment.

In D157750#4593582 <https://reviews.llvm.org/D157750#4593582>, @dhoekwater 
wrote:

> This patch will make it difficult to write tests for MFS on AArch64 before it 
> is officially enabled. Currently, because clang performs the Triple check, we 
> can use `-enable-split-machine-functions` to run tests with MFS on Arm, but 
> after this patch the flag won't do anything. Is there a way that we can land 
> this patch while still making MFS testable on AArch64?

Discussed with @dhoekwater offline, we decide to use a temporary hidden flag, 
something like "enable-mfs-for-debugging/testing", to force enable MFS for any 
triple during the period when MFS for arm is progressively rolled out, and when 
all is done, we will remove that temporary flag.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D157750/new/

https://reviews.llvm.org/D157750

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