[SubZero][MIPS32]: Add return registers for float/double types in lowerCall

src/IceTargetLoweringMIPS32.cpp

Index: src/IceTargetLoweringMIPS32.cpp
diff --git a/src/IceTargetLoweringMIPS32.cpp b/src/IceTargetLoweringMIPS32.cpp
index f4cdb421e579fa7e36cfecc7540dfa1b134cffcd..7a91331cd8aa95362b94b4553e8c71a5ed644a99 100644
--- a/src/IceTargetLoweringMIPS32.cpp
+++ b/src/IceTargetLoweringMIPS32.cpp
@@ -1768,9 +1768,12 @@ void TargetMIPS32::lowerCall(const InstCall *Instr) {
       ReturnRegHi = I32Reg(RegMIPS32::Reg_V1);
       break;
     case IceType_f32:
+      ReturnReg = makeReg(Dest->getType(), RegMIPS32::Reg_F0);
+      break;
     case IceType_f64:
-      UnimplementedLoweringError(this, Instr);
-      return;
+      ReturnReg = makeReg(IceType_f32, RegMIPS32::Reg_F0);
+      ReturnRegHi = makeReg(IceType_f32, RegMIPS32::Reg_F1);
+      break;
     case IceType_v4i1:
     case IceType_v8i1:
     case IceType_v16i1: