PPC/s390: [turbofan] Introduce Float64Pow and NumberPow operators.

src/compiler/ppc/code-generator-ppc.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/code-generator.h"
 
 #include "src/ast/scopes.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 1283 matching lines @@
       break;
     case kIeee754Float64Log1p:
       ASSEMBLE_IEEE754_UNOP(log1p);
       break;
     case kIeee754Float64Log2:
       ASSEMBLE_IEEE754_UNOP(log2);
       break;
     case kIeee754Float64Log10:
       ASSEMBLE_IEEE754_UNOP(log10);
       break;
+    case kIeee754Float64Pow: {
+      MathPowStub stub(isolate(), MathPowStub::DOUBLE);
+      __ CallStub(&stub);
+      __ Move(d1, d3);
+      break;
+    }
     case kPPC_Neg:
       __ neg(i.OutputRegister(), i.InputRegister(0), LeaveOE, i.OutputRCBit());
       break;
     case kPPC_MaxDouble:
       ASSEMBLE_FLOAT_MAX(kScratchDoubleReg);
       break;
     case kPPC_MinDouble:
       ASSEMBLE_FLOAT_MIN(kScratchDoubleReg);
       break;
     case kPPC_AbsDouble:
@@ skipping 910 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8