Fix ARM tests to be register allocator independent.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128680 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/ARM/peephole-bitcast.ll b/test/CodeGen/ARM/peephole-bitcast.ll
index 8d95d75..e670a5b 100644
--- a/test/CodeGen/ARM/peephole-bitcast.ll
+++ b/test/CodeGen/ARM/peephole-bitcast.ll
@@ -1,8 +1,11 @@
-; RUN: llc < %s -march=arm -mcpu=cortex-a8 | FileCheck %s
+; RUN: llc < %s -march=arm -mcpu=cortex-a8 -regalloc=linearscan | FileCheck %s
 
 ; vmov s0, r0 + vmov r0, s0 should have been optimized away.
 ; rdar://9104514
 
+; Peephole leaves a dead vmovsr instruction behind, and depends on linear scan
+; to remove it.
+
 define void @t(float %x) nounwind ssp {
 entry:
 ; CHECK:     t: