Fixes bug in MIPS IL.

runtime/vm/intermediate_language_mips.cc

Index: runtime/vm/intermediate_language_mips.cc
===================================================================
--- runtime/vm/intermediate_language_mips.cc	(revision 26194)
+++ runtime/vm/intermediate_language_mips.cc	(working copy)
@@ -3232,26 +3232,24 @@
 
 LocationSummary* UnaryDoubleOpInstr::MakeLocationSummary() const {
   const intptr_t kNumInputs = 1;
-  const intptr_t kNumTemps = 2;
+  const intptr_t kNumTemps = 1;
   LocationSummary* summary =
       new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresFpuRegister());
   summary->set_out(Location::RequiresFpuRegister());
-  summary->set_temp(0, Location::RequiresRegister());
-  summary->set_in(2, Location::RequiresFpuRegister());
+  summary->set_temp(0, Location::RequiresFpuRegister());
   return summary;
 }
 
 
 void UnaryDoubleOpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   // TODO(zra): Implement vneg.
-  Register temp = locs()->temp(0).reg();
   const Double& minus_one = Double::ZoneHandle(Double::NewCanonical(-1));
-  __ LoadObject(temp, minus_one);
+  __ LoadObject(TMP, minus_one);
   FpuRegister result = locs()->out().fpu_reg();
   FpuRegister value = locs()->in(0).fpu_reg();
-  FpuRegister temp_fp = locs()->temp(1).fpu_reg();
-  __ LoadDFromOffset(temp_fp, temp, Double::value_offset() - kHeapObjectTag);
+  FpuRegister temp_fp = locs()->temp(0).fpu_reg();
+  __ LoadDFromOffset(temp_fp, TMP, Double::value_offset() - kHeapObjectTag);
   __ muld(result, value, temp_fp);
 }