[GVN][NFCI] Use early return in phiTranslateImpl() (llvm#149273)

Author: madhur13490

llvm/lib/Transforms/Scalar/GVN.cpp

@@ -2367,11 +2367,14 @@ uint32_t GVNPass::ValueTable::phiTranslateImpl(const BasicBlock *Pred,
   // See if we can refine the value number by looking at the PN incoming value
   // for the given predecessor.
   if (PHINode *PN = NumberingPhi[Num]) {
-    if (PN->getParent() == PhiBlock)
-      for (unsigned I = 0; I != PN->getNumIncomingValues(); ++I)
-        if (PN->getIncomingBlock(I) == Pred)
-          if (uint32_t TransVal = lookup(PN->getIncomingValue(I), false))
-            return TransVal;
+    if (PN->getParent() != PhiBlock)
+      return Num;
+    for (unsigned I = 0; I != PN->getNumIncomingValues(); ++I) {
+      if (PN->getIncomingBlock(I) != Pred)
+        continue;
+      if (uint32_t TransVal = lookup(PN->getIncomingValue(I), false))
+        return TransVal;
+    }
     return Num;
   }