[LV] Widen freeze instead of scalarizing it

This patch changes the strategy for vectorizing freeze instrucion, from
replicating multiple times to widening according to selected VF.

Fixes #54992

Reviewed By: fhahn

Differential Revision: https://reviews.llvm.org/D125016

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

@@ -8444,6 +8444,7 @@ VPWidenRecipe *VPRecipeBuilder::tryToWiden(Instruction *I,
     case Instruction::URem:
     case Instruction::Xor:
     case Instruction::ZExt:
+    case Instruction::Freeze:
       return true;
     }
     return false;
@@ -9367,6 +9368,17 @@ void VPWidenRecipe::execute(VPTransformState &State) {
 
     break;
   }
+  case Instruction::Freeze: {
+    State.ILV->setDebugLocFromInst(&I);
+
+    for (unsigned Part = 0; Part < State.UF; ++Part) {
+      Value *Op = State.get(getOperand(0), Part);
+
+      Value *Freeze = Builder.CreateFreeze(Op);
+      State.set(this, Freeze, Part);
+    }
+    break;
+  }
   case Instruction::ICmp:
   case Instruction::FCmp: {
     // Widen compares. Generate vector compares.