Add support for the 'x' constraint.

Part of rdar://9307836 and rdar://9119939


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134215 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/ARM/inlineasm3.ll b/test/CodeGen/ARM/inlineasm3.ll
index 58687b9..f09deb3 100644
--- a/test/CodeGen/ARM/inlineasm3.ll
+++ b/test/CodeGen/ARM/inlineasm3.ll
@@ -58,3 +58,13 @@
 call void asm sideeffect "flds s15, $0 \0A", "*^Uvm,~{s15}"(float* @k.2126) nounwind
 ret i32 0
 }
+
+; Radar 9307836 & 9119939
+
+define float @t6(float %y) nounwind {
+entry:
+; CHECK: t6
+; CHECK: flds s15, s0
+  %0 = tail call float asm "flds s15, $0", "=x"() nounwind
+  ret float %0
+}