[Transforms] Fix typo in comments

[fhahn]

LGTM, thanks!

[Eymay]

Thanks @fhahn. Can you land this patch for me?
Please use “Eymen Ünay [e-mail]" to commit the change.

llvm/include/llvm/Transforms/Utils/ScalarEvolutionExpander.h

bool isHighCostExpansion(ArrayRef<const SCEV *> Exprs, Loop *L,
     assert(Cost <= ScaledBudget && "Should have returned from inner loop.");
     return false;
   }
 
   /// Return the induction variable increment's IV operand.
   Instruction *getIVIncOperand(Instruction *IncV, Instruction *InsertPos,
                                bool allowScale);
 
-  /// Utility for hoisting \p IncV (with all subexpressions requried for its
+  /// Utility for hoisting \p IncV (with all subexpressions required for its
   /// computation) before \p InsertPos. If \p RecomputePoisonFlags is set, drops
   /// all poison-generating flags from instructions being hoisted and tries to
   /// re-infer them in the new location. It should be used when we are going to
   /// introduce a new use in the new position that didn't exist before, and may
   /// trigger new UB in case of poison.
   bool hoistIVInc(Instruction *IncV, Instruction *InsertPos,
                   bool RecomputePoisonFlags = false);
 

llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp

struct SCEVDbgValueBuilder {
   }
 
   /// Combine a translation of the SCEV and the IV to create an expression that
   /// recovers a location's value.
   /// returns true if an expression was created.
   bool createIterCountExpr(const SCEV *S,
                            const SCEVDbgValueBuilder &IterationCount,
                            ScalarEvolution &SE) {
-    // SCEVs for SSA values are most frquently of the form
+    // SCEVs for SSA values are most frequently of the form
     // {start,+,stride}, but sometimes they are ({start,+,stride} + %a + ..).
     // This is because %a is a PHI node that is not the IV. However, these
     // SCEVs have not been observed to result in debuginfo-lossy optimisations,
     // so its not expected this point will be reached.
     if (!isa<SCEVAddRecExpr>(S))
       return false;
 
     LLVM_DEBUG(dbgs() << "scev-salvage: Location to salvage SCEV: " << *S