Hans Wennborg 9330005a54 Reapply r373431 "Switch lowering: omit range check for bit tests when default is unreachable (PR43129)" ...

This was reverted in r373454 due to breaking the expensive-checks bot.
This version addresses that by omitting the addSuccessorWithProb() call
when omitting the range check.

> Switch lowering: omit range check for bit tests when default is unreachable (PR43129)
>
> This is modeled after the same functionality for jump tables, which was
> added in r357067.
>
> Differential revision: https://reviews.llvm.org/D68131

llvm-svn: 373477

2019-10-02 14:35:06 +00:00

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