[turbofan] Introduce Float64Pow and NumberPow operators.

src/compiler/mips/instruction-selector-mips.cc

Index: src/compiler/mips/instruction-selector-mips.cc
diff --git a/src/compiler/mips/instruction-selector-mips.cc b/src/compiler/mips/instruction-selector-mips.cc
index c95613eba8b058b14aef800575db748cbe8528e5..41a133997504f5f9fe4759bbf3bab4dbf3ddb5d6 100644
--- a/src/compiler/mips/instruction-selector-mips.cc
+++ b/src/compiler/mips/instruction-selector-mips.cc
@@ -937,8 +937,8 @@ void InstructionSelector::VisitFloat64Neg(Node* node) { UNREACHABLE(); }
 void InstructionSelector::VisitFloat64Ieee754Binop(Node* node,
                                                    InstructionCode opcode) {
   MipsOperandGenerator g(this);
-  Emit(opcode, g.DefineAsFixed(node, f0), g.UseFixed(node->InputAt(0), f12),
-       g.UseFixed(node->InputAt(1), f14))
+  Emit(opcode, g.DefineAsFixed(node, f0), g.UseFixed(node->InputAt(0), f2),
+       g.UseFixed(node->InputAt(1), f4))
       ->MarkAsCall();
 }