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

src/ia32/code-stubs-ia32.h

Index: src/ia32/code-stubs-ia32.h
diff --git a/src/ia32/code-stubs-ia32.h b/src/ia32/code-stubs-ia32.h
index 3aa18f250af05b1c45c8b2c4f4cf2f12d650bd52..9ae6626134ebfc2f6f2f7683b24bf95b5ad738e4 100644
--- a/src/ia32/code-stubs-ia32.h
+++ b/src/ia32/code-stubs-ia32.h
@@ -188,7 +188,7 @@ class RecordWriteStub: public PlatformCodeStub {
         break;
     }
     DCHECK(GetMode(stub) == mode);
-    CpuFeatures::FlushICache(stub->instruction_start(), 7);
+    Assembler::FlushICacheWithoutIsolate(stub->instruction_start(), 7);
   }
 
   DEFINE_NULL_CALL_INTERFACE_DESCRIPTOR();