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89218827c8
When rematerializing through truncates, the coalescer may produce instructions with dead defs, but live implicit-defs of subregs: E.g. %X1<def,dead> = MOVi64imm 2, %W1<imp-def>; %X1:GPR64, %W1:GPR32 These instructions are live, and their definitions should not be rewritten. Fixes <rdar://problem/16492408> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205565 91177308-0d34-0410-b5e6-96231b3b80d8
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