Use option -march instead of -mtriple to avoid overconditionalizing the test.

This fixes r234439, which was committed to fix the test failures caused by
r234430.

llvm-svn: 234451

llvm/test/CodeGen/AArch64/merge-store.ll

@@ -1,10 +1,10 @@
-; RUN: llc -mtriple=arm64-apple-ios7.0 %s -o - | FileCheck %s
+; RUN: llc -march aarch64 %s -o - | FileCheck %s
 
 @g0 = external global <3 x float>, align 16
 @g1 = external global <3 x float>, align 4
 
 ; CHECK: ldr s[[R0:[0-9]+]], {{\[}}[[R1:x[0-9]+]]{{\]}}, #4
-; CHECK: ld1.s { v[[R0]] }[1], {{\[}}[[R1]]{{\]}}
+; CHECK: ld1{{\.?s?}} { v[[R0]]{{\.?s?}} }[1], {{\[}}[[R1]]{{\]}}
 ; CHECK: str d[[R0]]
 
 define void @blam() {