Lazily initialize fast_sqrt() and pass an Isolate parameter to it

src/ppc/codegen-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/ppc/codegen-ppc.h"
 
 #if V8_TARGET_ARCH_PPC
 
 #include "src/codegen.h"
 #include "src/macro-assembler.h"
@@ skipping 56 matching lines @@
 
 #if !defined(USE_SIMULATOR)
   return FUNCTION_CAST<UnaryMathFunctionWithIsolate>(buffer);
 #else
   fast_exp_ppc_machine_code = buffer;
   return &fast_exp_simulator;
 #endif
 }
 
 
-UnaryMathFunction CreateSqrtFunction() {
+UnaryMathFunctionWithIsolate CreateSqrtFunction(Isolate* isolate) {
 #if defined(USE_SIMULATOR)
-  return &std::sqrt;
+  return nullptr;
 #else
   size_t actual_size;
   byte* buffer =
       static_cast<byte*>(base::OS::Allocate(1 * KB, &actual_size, true));
-  if (buffer == NULL) return &std::sqrt;
+  if (buffer == nullptr) return nullptr;
 
-  MacroAssembler masm(NULL, buffer, static_cast<int>(actual_size),
+  MacroAssembler masm(isolate, buffer, static_cast<int>(actual_size),
                       CodeObjectRequired::kNo);
 
 // Called from C
   __ function_descriptor();
 
   __ MovFromFloatParameter(d1);
   __ fsqrt(d1, d1);
   __ MovToFloatResult(d1);
   __ Ret();
 
   CodeDesc desc;
   masm.GetCode(&desc);
 #if !ABI_USES_FUNCTION_DESCRIPTORS
   DCHECK(!RelocInfo::RequiresRelocation(desc));
 #endif
 
-  Assembler::FlushICacheWithoutIsolate(buffer, actual_size);
+  Assembler::FlushICache(isolate, buffer, actual_size);
   base::OS::ProtectCode(buffer, actual_size);
-  return FUNCTION_CAST<UnaryMathFunction>(buffer);
+  return FUNCTION_CAST<UnaryMathFunctionWithIsolate>(buffer);
 #endif
 }
 
 #undef __
 
 
 // -------------------------------------------------------------------------
 // Platform-specific RuntimeCallHelper functions.
 
 void StubRuntimeCallHelper::BeforeCall(MacroAssembler* masm) const {
@@ skipping 559 matching lines @@
     patcher.masm()->Jump(r3);
     for (int i = 0; i < kCodeAgingSequenceNops; i++) {
       patcher.masm()->nop();
     }
   }
 }
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC