MIPS: Sharing of descriptor arrays.

src/mips/macro-assembler-mips.h

Index: src/mips/macro-assembler-mips.h
diff --git a/src/mips/macro-assembler-mips.h b/src/mips/macro-assembler-mips.h
index 2a77d6ce2305edf67ded888aa2c9aafddaa0a2cf..dcbeb9fd0e81c1500bf83bb507e764df55ad5a0a 100644
--- a/src/mips/macro-assembler-mips.h
+++ b/src/mips/macro-assembler-mips.h
@@ -1400,7 +1400,15 @@ class MacroAssembler: public Assembler {
                                Register descriptors,
                                Register scratch);
   void EnumLength(Register dst, Register map);
-
+  void NumberOfOwnDescriptors(Register dst, Register map);
+
+  template<typename Field>
+  void DecodeField(Register reg) {
+    static const int shift = Field::kShift;
+    static const int mask = (Field::kMask >> shift) << kSmiTagSize;
+    srl(reg, reg, shift);
+    And(reg, reg, Operand(mask));
+  }
 
   // Activation support.
   void EnterFrame(StackFrame::Type type);