[Subzero][MIPS32] Implement bitcast operation for both 32-bit and 64-bit operands

src/IceInstMIPS32.cpp

Index: src/IceInstMIPS32.cpp
diff --git a/src/IceInstMIPS32.cpp b/src/IceInstMIPS32.cpp
index a508a8a90151560d01352bc73d917ee3e5637562..02b6d9baf1781210dee428a28b5d7db05bc2067a 100644
--- a/src/IceInstMIPS32.cpp
+++ b/src/IceInstMIPS32.cpp
@@ -283,13 +283,20 @@ InstMIPS32Call::InstMIPS32Call(Cfg *Func, Variable *Dest, Operand *CallTarget)
   addSource(CallTarget);
 }
 
-InstMIPS32Mov::InstMIPS32Mov(Cfg *Func, Variable *Dest, Operand *Src)
+InstMIPS32Mov::InstMIPS32Mov(Cfg *Func, Variable *Dest, Operand *Src,
+                             Operand *Src2)
     : InstMIPS32(Func, InstMIPS32::Mov, 2, Dest) {
   auto *Dest64 = llvm::dyn_cast<Variable64On32>(Dest);
   auto *Src64 = llvm::dyn_cast<Variable64On32>(Src);
 
   assert(Dest64 == nullptr || Src64 == nullptr);
 
+  if (Dest->getType() == IceType_f64 && Src2 != nullptr) {
+    addSource(Src);
+    addSource(Src2);
+    return;
+  }
+
   if (Dest64 != nullptr) {
     // this-> is needed below because there is a parameter named Dest.
     this->Dest = Dest64->getLo();