Matthias Braun b6aa399b96 RegisterCoalescer: Gracefully continue if subrange merging fails.
There is a known bug where the register coalescer fails to merge
subranges when multiple ranges end up in the "overflow" bit 32 of the
lanemasks. A proper fix for this is complicated so for now this is a
workaround which lets the register coalescer drop the subregister
liveness information (we just loose some precision by that) and
continue.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231186 91177308-0d34-0410-b5e6-96231b3b80d8
2015-03-04 00:43:50 +00:00
..
2015-01-30 18:07:45 +00:00