MIPS: [turbofan] Support for %_DoubleHi, %_DoubleLo and %_ConstructDouble.

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 f29c2ee93d8048b80baab44a5cd7df7c588a885f..e20fa0a2ca7d3938647f3c10e584c0e07a3c6536 100644
--- a/src/mips/macro-assembler-mips.h
+++ b/src/mips/macro-assembler-mips.h
@@ -241,10 +241,18 @@ class MacroAssembler: public Assembler {
     Mfhc1(dst_high, src);
   }
 
+  inline void FmoveHigh(FPURegister dst, Register src_high) {
+    Mthc1(src_high, dst);
+  }
+
   inline void FmoveLow(Register dst_low, FPURegister src) {
     mfc1(dst_low, src);
   }
 
+  inline void FmoveLow(FPURegister dst, Register src_low) {
+    mtc1(src_low, dst);
+  }
+
   inline void Move(FPURegister dst, Register src_low, Register src_high) {
     mtc1(src_low, dst);
     Mthc1(src_high, dst);