[NFC] Remove isSafeToSpeculativelyExecute checks for casts

[kachkov98]

Summary

isSafeToSpeculativelyExecute always return true for casts, so remove
this redundant checks.

[mkazantsev]

LG

llvm/lib/Analysis/PHITransAddr.cpp

 #include "llvm/Support/raw_ostream.h"
 using namespace llvm;
 
 static cl::opt<bool> EnableAddPhiTranslation(
     "gvn-add-phi-translation", cl::init(false), cl::Hidden,
     cl::desc("Enable phi-translation of add instructions"));
 
 static bool canPHITrans(Instruction *Inst) {
-  if (isa<PHINode>(Inst) ||
-      isa<GetElementPtrInst>(Inst))
-    return true;
-
-  if (isa<CastInst>(Inst) &&
-      isSafeToSpeculativelyExecute(Inst))
+  if (isa<PHINode>(Inst) || isa<GetElementPtrInst>(Inst) || isa<CastInst>(Inst))
     return true;
 
   if (Inst->getOpcode() == Instruction::Add &&
       isa<ConstantInt>(Inst->getOperand(1)))
     return true;
 
   return false;
 }
for (unsigned i = 0, e = Inst->getNumOperands(); i != e; ++i)
         InstInputs.push_back(Op);
   }
 
   // Ok, it must be an intermediate result (either because it started that way
   // or because we just incorporated it into the expression).  See if its
   // operands need to be phi translated, and if so, reconstruct it.
 
   if (CastInst *Cast = dyn_cast<CastInst>(Inst)) {
-    if (!isSafeToSpeculativelyExecute(Cast)) return nullptr;
     Value *PHIIn = translateSubExpr(Cast->getOperand(0), CurBB, PredBB, DT);
     if (!PHIIn) return nullptr;
     if (PHIIn == Cast->getOperand(0))
       return Cast;
 
     // Find an available version of this cast.
 
     // Constants are trivial to find.
Value *PHITransAddr::insertTranslatedSubExpr(
 
   // We don't need to PHI translate values which aren't instructions.
   auto *Inst = dyn_cast<Instruction>(InVal);
   if (!Inst)
     return nullptr;
 
   // Handle cast of PHI translatable value.
   if (CastInst *Cast = dyn_cast<CastInst>(Inst)) {
-    if (!isSafeToSpeculativelyExecute(Cast)) return nullptr;
     Value *OpVal = insertTranslatedSubExpr(Cast->getOperand(0), CurBB, PredBB,
                                            DT, NewInsts);
     if (!OpVal) return nullptr;
 
     // Otherwise insert a cast at the end of PredBB.
     CastInst *New = CastInst::Create(Cast->getOpcode(), OpVal, InVal->getType(),
                                      InVal->getName() + ".phi.trans.insert",
                                      PredBB->getTerminator());