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

test/cctest/test-code-stubs-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Rrdistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Rrdistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Rrdistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 104 matching lines @@
 
   // Restore callee save registers.
   __ Mov(csp, jssp);
   __ SetStackPointer(csp);
   __ PopCalleeSavedRegisters();
 
   __ Ret();
 
   CodeDesc desc;
   masm.GetCode(&desc);
-  CpuFeatures::FlushICache(buffer, actual_size);
+  Assembler::FlushICache(isolate, buffer, actual_size);
   return (reinterpret_cast<ConvertDToIFunc>(
       reinterpret_cast<intptr_t>(buffer)));
 }
 
 #undef __
 
 
 static Isolate* GetIsolateFrom(LocalContext* context) {
   return reinterpret_cast<Isolate*>((*context)->GetIsolate());
 }
@@ skipping 44 matching lines @@
                                         false));
       RunAllTruncationTests(
           RunGeneratedCodeCallWrapper,
           MakeConvertDToIFuncTrampoline(isolate,
                                         source_registers[s],
                                         dest_registers[d],
                                         true));
     }
   }
 }