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

test/cctest/test-assembler-arm64.cc

Index: test/cctest/test-assembler-arm64.cc
diff --git a/test/cctest/test-assembler-arm64.cc b/test/cctest/test-assembler-arm64.cc
index 3c2f840058aadb6cc7123ee5eb7e8dfd3d84a8d4..a6ad8fd38fc54ccf2160dba8548d6993de1a16f6 100644
--- a/test/cctest/test-assembler-arm64.cc
+++ b/test/cctest/test-assembler-arm64.cc
@@ -191,12 +191,12 @@ static void InitializeVM() {
   RESET();                                                                     \
   START_AFTER_RESET();
 
-#define RUN()                                                \
-  CpuFeatures::FlushICache(buf, masm.SizeOfGeneratedCode()); \
-  {                                                          \
-    void (*test_function)(void);                             \
-    memcpy(&test_function, &buf, sizeof(buf));               \
-    test_function();                                         \
+#define RUN()                                                            \
+  Assembler::FlushICacheWithoutIsolate(buf, masm.SizeOfGeneratedCode()); \
+  {                                                                      \
+    void (*test_function)(void);                                         \
+    memcpy(&test_function, &buf, sizeof(buf));                           \
+    test_function();                                                     \
   }
 
 #define END()                                                                  \