[turbofan] Introduce Float64Pow and NumberPow operators.

src/compiler/instruction-scheduler.cc

Index: src/compiler/instruction-scheduler.cc
diff --git a/src/compiler/instruction-scheduler.cc b/src/compiler/instruction-scheduler.cc
index 3ef7c084abb02bf77028129b5ea4daa23e261f59..c43c5e443540d9c25c98d611f906696bea9da802 100644
--- a/src/compiler/instruction-scheduler.cc
+++ b/src/compiler/instruction-scheduler.cc
@@ -235,6 +235,7 @@ int InstructionScheduler::GetInstructionFlags(const Instruction* instr) const {
     case kIeee754Float64Log1p:
     case kIeee754Float64Log10:
     case kIeee754Float64Log2:
+    case kIeee754Float64Pow:
     case kIeee754Float64Sin:
     case kIeee754Float64Tan:
       return kNoOpcodeFlags;