MIPS: Start using OStreams.

Port r22179 (01402bc)

Original commit message:
Note that until everything is OStream-based, there are a few places
where we have to do some impedance matching. A few accessors had to be
const-corrected on the way.

BUG=
R=palfia@homejinni.com

Review URL: https://codereview.chromium.org/369873002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22196 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mips/code-stubs-mips.cc

@@ -418,8 +418,8 @@ class ConvertToDoubleStub : public PlatformCodeStub {
   class ModeBits: public BitField<OverwriteMode, 0, 2> {};
   class OpBits: public BitField<Token::Value, 2, 14> {};
 
-  Major MajorKey() { return ConvertToDouble; }
-  int MinorKey() {
+  Major MajorKey() const { return ConvertToDouble; }
+  int MinorKey() const {
     // Encode the parameters in a unique 16 bit value.
     return  result1_.code() +
            (result2_.code() << 4) +

src/mips/code-stubs-mips.h

@@ -28,8 +28,8 @@ class StoreBufferOverflowStub: public PlatformCodeStub {
  private:
   SaveFPRegsMode save_doubles_;
 
-  Major MajorKey() { return StoreBufferOverflow; }
-  int MinorKey() { return (save_doubles_ == kSaveFPRegs) ? 1 : 0; }
+  Major MajorKey() const { return StoreBufferOverflow; }
+  int MinorKey() const { return (save_doubles_ == kSaveFPRegs) ? 1 : 0; }
 };
 
 
@@ -69,12 +69,13 @@ class SubStringStub: public PlatformCodeStub {
   explicit SubStringStub(Isolate* isolate) : PlatformCodeStub(isolate) {}
 
  private:
-  Major MajorKey() { return SubString; }
-  int MinorKey() { return 0; }
+  Major MajorKey() const { return SubString; }
+  int MinorKey() const { return 0; }
 
   void Generate(MacroAssembler* masm);
 };
 
+
 class StoreRegistersStateStub: public PlatformCodeStub {
  public:
   explicit StoreRegistersStateStub(Isolate* isolate, SaveFPRegsMode with_fp)
@@ -82,8 +83,8 @@ class StoreRegistersStateStub: public PlatformCodeStub {
 
   static void GenerateAheadOfTime(Isolate* isolate);
  private:
-  Major MajorKey() { return StoreRegistersState; }
-  int MinorKey() { return (save_doubles_ == kSaveFPRegs) ? 1 : 0; }
+  Major MajorKey() const { return StoreRegistersState; }
+  int MinorKey() const { return (save_doubles_ == kSaveFPRegs) ? 1 : 0; }
   SaveFPRegsMode save_doubles_;
 
   void Generate(MacroAssembler* masm);
@@ -96,8 +97,8 @@ class RestoreRegistersStateStub: public PlatformCodeStub {
 
   static void GenerateAheadOfTime(Isolate* isolate);
  private:
-  Major MajorKey() { return RestoreRegistersState; }
-  int MinorKey() { return (save_doubles_ == kSaveFPRegs) ? 1 : 0; }
+  Major MajorKey() const { return RestoreRegistersState; }
+  int MinorKey() const { return (save_doubles_ == kSaveFPRegs) ? 1 : 0; }
   SaveFPRegsMode save_doubles_;
 
   void Generate(MacroAssembler* masm);
@@ -126,8 +127,8 @@ class StringCompareStub: public PlatformCodeStub {
                                             Register scratch3);
 
  private:
-  virtual Major MajorKey() { return StringCompare; }
-  virtual int MinorKey() { return 0; }
+  virtual Major MajorKey() const { return StringCompare; }
+  virtual int MinorKey() const { return 0; }
   virtual void Generate(MacroAssembler* masm);
 
   static void GenerateAsciiCharsCompareLoop(MacroAssembler* masm,
@@ -176,8 +177,8 @@ class WriteInt32ToHeapNumberStub : public PlatformCodeStub {
   class ScratchRegisterBits: public BitField<int, 8, 4> {};
   class SignRegisterBits: public BitField<int, 12, 4> {};
 
-  Major MajorKey() { return WriteInt32ToHeapNumber; }
-  int MinorKey() {
+  Major MajorKey() const { return WriteInt32ToHeapNumber; }
+  int MinorKey() const {
     // Encode the parameters in a unique 16 bit value.
     return IntRegisterBits::encode(the_int_.code())
            | HeapNumberRegisterBits::encode(the_heap_number_.code())
@@ -347,9 +348,9 @@ class RecordWriteStub: public PlatformCodeStub {
       Mode mode);
   void InformIncrementalMarker(MacroAssembler* masm);
 
-  Major MajorKey() { return RecordWrite; }
+  Major MajorKey() const { return RecordWrite; }
 
-  int MinorKey() {
+  int MinorKey() const {
     return ObjectBits::encode(object_.code()) |
         ValueBits::encode(value_.code()) |
         AddressBits::encode(address_.code()) |
@@ -389,8 +390,8 @@ class DirectCEntryStub: public PlatformCodeStub {
   void GenerateCall(MacroAssembler* masm, Register target);
 
  private:
-  Major MajorKey() { return DirectCEntry; }
-  int MinorKey() { return 0; }
+  Major MajorKey() const { return DirectCEntry; }
+  int MinorKey() const { return 0; }
 
   bool NeedsImmovableCode() { return true; }
 };
@@ -435,11 +436,9 @@ class NameDictionaryLookupStub: public PlatformCodeStub {
       NameDictionary::kHeaderSize +
       NameDictionary::kElementsStartIndex * kPointerSize;
 
-  Major MajorKey() { return NameDictionaryLookup; }
+  Major MajorKey() const { return NameDictionaryLookup; }
 
-  int MinorKey() {
-    return LookupModeBits::encode(mode_);
-  }
+  int MinorKey() const { return LookupModeBits::encode(mode_); }
 
   class LookupModeBits: public BitField<LookupMode, 0, 1> {};