MIPS32: Implement UnsafeCASInt and UnsafeCASObject intrinsics.

Change-Id: Ie871763b9a36075fd3d70ee6e2e241ae1ccc36cf
diff --git a/compiler/utils/mips/assembler_mips.h b/compiler/utils/mips/assembler_mips.h
index a7179fd..ffac4c4 100644
--- a/compiler/utils/mips/assembler_mips.h
+++ b/compiler/utils/mips/assembler_mips.h
@@ -191,6 +191,11 @@
   void Swl(Register rt, Register rs, uint16_t imm16);
   void Swr(Register rt, Register rs, uint16_t imm16);
 
+  void LlR2(Register rt, Register base, int16_t imm16 = 0);
+  void ScR2(Register rt, Register base, int16_t imm16 = 0);
+  void LlR6(Register rt, Register base, int16_t imm9 = 0);
+  void ScR6(Register rt, Register base, int16_t imm9 = 0);
+
   void Slt(Register rd, Register rs, Register rt);
   void Sltu(Register rd, Register rs, Register rt);
   void Slti(Register rt, Register rs, uint16_t imm16);