[turbofan] Introduce Float64Pow and NumberPow operators.

src/compiler/mips64/instruction-selector-mips64.cc

Index: src/compiler/mips64/instruction-selector-mips64.cc
diff --git a/src/compiler/mips64/instruction-selector-mips64.cc b/src/compiler/mips64/instruction-selector-mips64.cc
index 3e1f98e5e27abbf1f824b1e922360affa89a6c9a..42b6128e109f290034eff75a8793861b60d25aa4 100644
--- a/src/compiler/mips64/instruction-selector-mips64.cc
+++ b/src/compiler/mips64/instruction-selector-mips64.cc
@@ -1343,8 +1343,8 @@ void InstructionSelector::VisitFloat64Neg(Node* node) { UNREACHABLE(); }
 void InstructionSelector::VisitFloat64Ieee754Binop(Node* node,
                                                    InstructionCode opcode) {
   Mips64OperandGenerator 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();
 }