MIPS: Added CallInterfaceDescriptors to all code stubs.

src/mips/lithium-codegen-mips.cc

Index: src/mips/lithium-codegen-mips.cc
diff --git a/src/mips/lithium-codegen-mips.cc b/src/mips/lithium-codegen-mips.cc
index aca6bb36199126681254fe7d98e18cda18767cd6..0f6a6a1a0233b248ccbbdbfee0f4ca78b6a4ae35 100644
--- a/src/mips/lithium-codegen-mips.cc
+++ b/src/mips/lithium-codegen-mips.cc
@@ -3854,10 +3854,11 @@ void LCodeGen::DoPower(LPower* instr) {
   Representation exponent_type = instr->hydrogen()->right()->representation();
   // Having marked this as a call, we can use any registers.
   // Just make sure that the input/output registers are the expected ones.
+  Register tagged_exponent = MathPowTaggedDescriptor::exponent();
   DCHECK(!instr->right()->IsDoubleRegister() ||
          ToDoubleRegister(instr->right()).is(f4));
   DCHECK(!instr->right()->IsRegister() ||
-         ToRegister(instr->right()).is(a2));
+         ToRegister(instr->right()).is(tagged_exponent));
   DCHECK(ToDoubleRegister(instr->left()).is(f2));
   DCHECK(ToDoubleRegister(instr->result()).is(f0));
 
@@ -3866,8 +3867,9 @@ void LCodeGen::DoPower(LPower* instr) {
     __ CallStub(&stub);
   } else if (exponent_type.IsTagged()) {
     Label no_deopt;
-    __ JumpIfSmi(a2, &no_deopt);
-    __ lw(t3, FieldMemOperand(a2, HeapObject::kMapOffset));
+    __ JumpIfSmi(tagged_exponent, &no_deopt);
+    DCHECK(!t3.is(tagged_exponent));
+    __ lw(t3, FieldMemOperand(tagged_exponent, HeapObject::kMapOffset));
     __ LoadRoot(at, Heap::kHeapNumberMapRootIndex);
     DeoptimizeIf(ne, instr->environment(), t3, Operand(at));
     __ bind(&no_deopt);