James Y Knight 99a2ce2af2 Check for register clobbers when merging a vreg live range with a
reserved physreg in RegisterCoalescer.

Previously, we only checked for clobbers when merging into a READ of
the physreg, but not when merging from a WRITE to the physreg.

Differential Revision: https://reviews.llvm.org/D28527

llvm-svn: 291942
2017-01-13 19:08:36 +00:00
..
2016-05-18 09:14:13 +00:00