[PATCH] D142834: [RFC][X86][MC] Update and clarify the behavior of functions getX86SubSuperRegister*

[Phoebe Wang via Phabricator via llvm-commits]

pengfei added a comment.

In D142834#4088776 <https://reviews.llvm.org/D142834#4088776>, @skan wrote:

> Not use report_fatal_error b/c it's unrelated to user input

There will be difference with dedicated cases, e.g.: https://godbolt.org/z/oca6bj4s3


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