Fixes ARM SIMD IL bug.

runtime/vm/intermediate_language_arm.cc

Index: runtime/vm/intermediate_language_arm.cc
===================================================================
--- runtime/vm/intermediate_language_arm.cc	(revision 29083)
+++ runtime/vm/intermediate_language_arm.cc	(working copy)
@@ -3308,10 +3308,11 @@
 void Float32x4SqrtInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   QRegister left = locs()->in(0).fpu_reg();
   QRegister result = locs()->out().fpu_reg();
+  QRegister temp = locs()->temp(0).fpu_reg();
 
   switch (op_kind()) {
     case MethodRecognizer::kFloat32x4Sqrt:
-      __ Vsqrtqs(result, left);
+      __ Vsqrtqs(result, left, temp);

[Florian Schneider, 2013/10/23 15:36:02]

It seems this instruction is only used here. I'd make the temp argument
mandatory, instead of optional. Otherwise, it is really confusing that in one
case left is overwritten, and when passing a temp it is preserved.

[zra, 2013/10/23 15:56:17]

Done.

       break;
     case MethodRecognizer::kFloat32x4Reciprocal:
       __ Vreciprocalqs(result, left);