Remove the dependency of Zone on Isolate

src/mips/regexp-macro-assembler-mips.h

Index: src/mips/regexp-macro-assembler-mips.h
diff --git a/src/mips/regexp-macro-assembler-mips.h b/src/mips/regexp-macro-assembler-mips.h
index c7d8f6dcfb49e82de58ec5ad5d3aeba558ac30fc..65ee173b0f31686103bda704654151fe8c409f0c 100644
--- a/src/mips/regexp-macro-assembler-mips.h
+++ b/src/mips/regexp-macro-assembler-mips.h
@@ -17,7 +17,8 @@ namespace internal {
 #ifndef V8_INTERPRETED_REGEXP
 class RegExpMacroAssemblerMIPS: public NativeRegExpMacroAssembler {
  public:
-  RegExpMacroAssemblerMIPS(Mode mode, int registers_to_save, Zone* zone);
+  RegExpMacroAssemblerMIPS(Isolate* isolate, Zone* zone, Mode mode,
+                           int registers_to_save);
   virtual ~RegExpMacroAssemblerMIPS();
   virtual int stack_limit_slack();
   virtual void AdvanceCurrentPosition(int by);