[SubZero] Implement GP to/from FP moves for MIPS

src/IceRegistersMIPS32.h

Index: src/IceRegistersMIPS32.h
diff --git a/src/IceRegistersMIPS32.h b/src/IceRegistersMIPS32.h
index 221356b83c6b0478db2542aa4af0b22f9d2e4c47..2880b74227e9d9a62bbeb121f15e4db92f61acd4 100644
--- a/src/IceRegistersMIPS32.h
+++ b/src/IceRegistersMIPS32.h
@@ -72,8 +72,11 @@ static inline GPRRegister getEncodedGPR(RegNumT RegNum) {
 }
 
 static inline bool isGPRReg(RegNumT RegNum) {
-  return (int(Reg_GPR_First) <= int(RegNum)) &&
-         (unsigned(RegNum) <= Reg_GPR_Last);
+  bool IsGPR = ((int(Reg_GPR_First) <= int(RegNum)) &&
+                (unsigned(RegNum) <= Reg_GPR_Last)) ||
+               ((int(Reg_I64PAIR_First) <= int(RegNum)) &&
+                (unsigned(RegNum) <= Reg_I64PAIR_Last));
+  return IsGPR;
 }
 
 static inline FPRRegister getEncodedFPR(RegNumT RegNum) {