Add double unary operation (negate).

runtime/vm/intermediate_language_ia32.cc

Index: runtime/vm/intermediate_language_ia32.cc
===================================================================
--- runtime/vm/intermediate_language_ia32.cc	(revision 26120)
+++ runtime/vm/intermediate_language_ia32.cc	(working copy)
@@ -3844,6 +3844,24 @@
 }
 
 
+LocationSummary* UnaryDoubleOpInstr::MakeLocationSummary() const {
+  const intptr_t kNumInputs = 1;
+  const intptr_t kNumTemps = 0;
+  LocationSummary* summary =
+      new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  summary->set_in(0, Location::RequiresFpuRegister());
+  summary->set_out(Location::SameAsFirstInput());
+  return summary;
+}
+
+
+void UnaryDoubleOpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
+  XmmRegister value = locs()->in(0).fpu_reg();
+  ASSERT(locs()->out().fpu_reg() == value);
+  __ DoubleNegate(value);
+}
+
+
 LocationSummary* SmiToDoubleInstr::MakeLocationSummary() const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;