X87: Make FlushICache part of Assembler(Base) and take Isolate as parameter.

src/x87/code-stubs-x87.h

Index: src/x87/code-stubs-x87.h
diff --git a/src/x87/code-stubs-x87.h b/src/x87/code-stubs-x87.h
index eb8654dc3e080b231cf6a34e13b0b8c545237eb5..25fc4d771820c308d85edc761b8a1b3451510203 100644
--- a/src/x87/code-stubs-x87.h
+++ b/src/x87/code-stubs-x87.h
@@ -185,7 +185,7 @@ class RecordWriteStub: public PlatformCodeStub {
         break;
     }
     DCHECK(GetMode(stub) == mode);
-    CpuFeatures::FlushICache(stub->instruction_start(), 7);
+    Assembler::FlushICache(stub->GetIsolate(), stub->instruction_start(), 7);
   }
 
   DEFINE_NULL_CALL_INTERFACE_DESCRIPTOR();