MIPS: Use PC realitive instructions on r6.

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 5cfbb3143ae3a684f6f8e6005067748bce9b7808..30066cce1e3d943f4ef93f15a6b21fd3f6cee461 100644
--- a/src/mips/macro-assembler-mips.h
+++ b/src/mips/macro-assembler-mips.h
@@ -642,6 +642,20 @@ class MacroAssembler: public Assembler {
 
 
   // ---------------------------------------------------------------------------
+  // PC relative instructions.
+
+  void Addiupc(Register rs, int32_t imm21) {
+    DCHECK_EQ(imm21 & 3, 0);
+    addiupc(rs, imm21 >> 2);
+  }
+
+  void Lwpc(Register rs, int32_t imm21) {
+    DCHECK_EQ(imm21 & 3, 0);
+    lwpc(rs, imm21 >> 2);
+  }
+
+
+  // ---------------------------------------------------------------------------
   // Pseudo-instructions.
 
   void mov(Register rd, Register rt) { or_(rd, rt, zero_reg); }