MIPS: Push safepoint registers in deferred number-to-i/u only on-demand.

src/mips/lithium-mips.cc

Index: src/mips/lithium-mips.cc
diff --git a/src/mips/lithium-mips.cc b/src/mips/lithium-mips.cc
index 1539deb9c3d701f885af866637d1c3813ca50ef2..c87066a50b64eb41849cd31002589b1a91d247b6 100644
--- a/src/mips/lithium-mips.cc
+++ b/src/mips/lithium-mips.cc
@@ -1771,12 +1771,16 @@ LInstruction* LChunkBuilder::DoChange(HChange* instr) {
       HValue* val = instr->value();
       LOperand* value = UseRegisterAtStart(val);
       if (val->CheckFlag(HInstruction::kUint32)) {
-        LNumberTagU* result = new(zone()) LNumberTagU(value);
+        LOperand* temp1 = TempRegister();
+        LOperand* temp2 = TempRegister();
+        LNumberTagU* result = new(zone()) LNumberTagU(value, temp1, temp2);
         return AssignEnvironment(AssignPointerMap(DefineAsRegister(result)));
       } else if (val->HasRange() && val->range()->IsInSmiRange()) {
         return DefineAsRegister(new(zone()) LSmiTag(value));
       } else {
-        LNumberTagI* result = new(zone()) LNumberTagI(value);
+        LOperand* temp1 = TempRegister();
+        LOperand* temp2 = TempRegister();
+        LNumberTagI* result = new(zone()) LNumberTagI(value, temp1, temp2);
         return AssignEnvironment(AssignPointerMap(DefineAsRegister(result)));
       }
     } else if (to.IsSmi()) {