PPC: Make FlushICache part of Assembler(Base) and take Isolate as parameter.

src/ppc/cpu-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.
 
 // CPU specific code for ppc independent of OS goes here.
 
 #if V8_TARGET_ARCH_PPC
 
 #include "src/assembler.h"
 #include "src/macro-assembler.h"
-#include "src/simulator.h"  // for cache flushing.
 
 namespace v8 {
 namespace internal {
 
 void CpuFeatures::FlushICache(void* buffer, size_t size) {
-  // Nothing to do flushing no instructions.
-  if (size == 0) {
-    return;
-  }
-
-#if defined(USE_SIMULATOR)
-  // Not generating PPC instructions for C-code. This means that we are
-  // building an PPC emulator based target.  We should notify the simulator
-  // that the Icache was flushed.
-  // None of this code ends up in the snapshot so there are no issues
-  // around whether or not to generate the code when building snapshots.
-  Simulator::FlushICache(Isolate::Current()->simulator_i_cache(), buffer, size);
-#else
-
+#if !defined(USE_SIMULATOR)
   if (CpuFeatures::IsSupported(INSTR_AND_DATA_CACHE_COHERENCY)) {
     __asm__ __volatile__(
         "sync \n"
         "icbi 0, %0  \n"
         "isync  \n"
         : /* no output */
         : "r"(buffer)
         : "memory");
     return;
   }
 
   const int kCacheLineSize = CpuFeatures::cache_line_size();
   intptr_t mask = kCacheLineSize - 1;
   byte *start =
       reinterpret_cast<byte *>(reinterpret_cast<intptr_t>(buffer) & ~mask);
   byte *end = static_cast<byte *>(buffer) + size;
   for (byte *pointer = start; pointer < end; pointer += kCacheLineSize) {
     __asm__(
         "dcbf 0, %0  \n"
         "sync        \n"
         "icbi 0, %0  \n"
         "isync       \n"
         : /* no output */
         : "r"(pointer));
   }
 
-#endif  // USE_SIMULATOR
+#endif  // !USE_SIMULATOR
 }
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC