[ConstraintSystem] NFC: Fix typo implact -> impact

Author: xedin

lib/Sema/CSSimplify.cpp

@@ -4093,7 +4093,7 @@ ConstraintSystem::SolutionKind ConstraintSystem::simplifyConformsToConstraint(
               fixRequirementFailure(*this, type, protocolTy, anchor, path)) {
         unsigned choiceImpact = 0;
         // If this requirement is associated with overload choice let's
-        // tie implact how many times this non-conforming type is mentioned.
+        // tie impact to how many times this non-conforming type is mentioned.
         if (auto *ODRE = dyn_cast_or_null<OverloadedDeclRefExpr>(anchor)) {
           auto *choice = findSelectedOverloadFor(ODRE);
           if (typeVar && choice) {

lib/Sema/ConstraintSystem.h

@@ -2063,7 +2063,7 @@ class ConstraintSystem {
 
   /// Log and record the application of the fix. Return true iff any
   /// subsequent solution would be worse than the best known solution.
-  bool recordFix(ConstraintFix *fix, unsigned implact = 1);
+  bool recordFix(ConstraintFix *fix, unsigned impact = 1);
 
   void recordHole(TypeVariableType *typeVar);