Add support for the arm 'y' asm modifier.

Fixes part of rdar://9444657


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132011 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/ARM/arm-modifier.ll b/test/CodeGen/ARM/arm-modifier.ll
new file mode 100644
index 0000000..051d7e7
--- /dev/null
+++ b/test/CodeGen/ARM/arm-modifier.ll
@@ -0,0 +1,15 @@
+; RUN: llc < %s -march=arm -mattr=+vfp2
+
+define i32 @foo(float %scale, float %scale2) nounwind ssp {
+entry:
+  %scale.addr = alloca float, align 4
+  %scale2.addr = alloca float, align 4
+  store float %scale, float* %scale.addr, align 4
+  store float %scale2, float* %scale2.addr, align 4
+  %tmp = load float* %scale.addr, align 4
+  %tmp1 = load float* %scale2.addr, align 4
+  call void asm sideeffect "vmul.f32    q0, q0, ${0:y} \0A\09vmul.f32    q1, q1, ${0:y} \0A\09vmul.f32    q1, q0, ${1:y} \0A\09", "w,w,~{q0},~{q1}"(float %tmp, float %tmp1) nounwind, !srcloc !0
+  ret i32 0
+}
+
+!0 = metadata !{i32 56, i32 89, i32 128, i32 168}