Add <imp-def> of super-register when lowering SUBREG_TO_REG.

Patch by Tyler Nowicki!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160888 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/X86/liveness-local-regalloc.ll b/test/CodeGen/X86/liveness-local-regalloc.ll
index faeeaa7..721f545 100644
--- a/test/CodeGen/X86/liveness-local-regalloc.ll
+++ b/test/CodeGen/X86/liveness-local-regalloc.ll
@@ -1,4 +1,4 @@
-; RUN: llc < %s -mcpu=generic -regalloc=fast -optimize-regalloc=0 -verify-machineinstrs -mtriple=x86_64-apple-darwin10
+; RUN: llc < %s -regalloc=fast -optimize-regalloc=0 -verify-machineinstrs -mtriple=x86_64-apple-darwin10
 ; <rdar://problem/7755473>
 ; PR12821