Remove the dependency of Zone on Isolate

src/x64/regexp-macro-assembler-x64.cc

Index: src/x64/regexp-macro-assembler-x64.cc
diff --git a/src/x64/regexp-macro-assembler-x64.cc b/src/x64/regexp-macro-assembler-x64.cc
index 82a3735d77e9ea1c4e3b9f7f4539f6d950419545..1818dbb72c7444658666bb20640bbea6bda6d8a4 100644
--- a/src/x64/regexp-macro-assembler-x64.cc
+++ b/src/x64/regexp-macro-assembler-x64.cc
@@ -93,12 +93,11 @@ namespace internal {
 
 #define __ ACCESS_MASM((&masm_))
 
-RegExpMacroAssemblerX64::RegExpMacroAssemblerX64(
-    Mode mode,
-    int registers_to_save,
-    Zone* zone)
-    : NativeRegExpMacroAssembler(zone),
-      masm_(zone->isolate(), NULL, kRegExpCodeSize),
+RegExpMacroAssemblerX64::RegExpMacroAssemblerX64(Isolate* isolate, Zone* zone,
+                                                 Mode mode,
+                                                 int registers_to_save)
+    : NativeRegExpMacroAssembler(isolate, zone),
+      masm_(isolate, NULL, kRegExpCodeSize),
       no_root_array_scope_(&masm_),
       code_relative_fixup_positions_(4, zone),
       mode_(mode),