Use ImplicitConversionSequence::setAsIdentityConversion(QualType). NFC

[arichardson]

Summary

Slightly reduces the amount of duplicated code.

[arichardson]

rebased on latest HEAD

lib/Sema/SemaOverload.cpp

if (From->getNumInits() == 1) {
     }
     // FIXME: Check the other conditions here: array of character type,
     // initializer is a string literal.
     if (ToType->isArrayType()) {
       InitializedEntity Entity =
         InitializedEntity::InitializeParameter(S.Context, ToType,
                                                /*Consumed=*/false);
       if (S.CanPerformCopyInitialization(Entity, From)) {
-        Result.setStandard();
-        Result.Standard.setAsIdentityConversion();
-        Result.Standard.setFromType(ToType);
-        Result.Standard.setAllToTypes(ToType);
+        Result.setAsIdentityConversion(ToType);
         return Result;
       }
     }
   }
 
   // C++14 [over.ics.list]p2: Otherwise, if the parameter type [...] (below).
   // C++11 [over.ics.list]p2:
   //   If the parameter type is std::initializer_list<X> or "array of X" and
for (unsigned i = 0, e = From->getNumInits(); i < e; ++i) {
                                              Result) ==
               ImplicitConversionSequence::Worse)
         Result = ICS;
     }
 
     // For an empty list, we won't have computed any conversion sequence.
     // Introduce the identity conversion sequence.
     if (From->getNumInits() == 0) {
-      Result.setStandard();
-      Result.Standard.setAsIdentityConversion();
-      Result.Standard.setFromType(ToType);
-      Result.Standard.setAllToTypes(ToType);
+      Result.setAsIdentityConversion(ToType);
     }
 
     Result.setStdInitializerListElement(toStdInitializerList);
     return Result;
   }
 
   // C++14 [over.ics.list]p4:
   // C++11 [over.ics.list]p3:
if (!ToType->isRecordType()) {
     if (NumInits == 1 && !isa<InitListExpr>(From->getInit(0)))
       Result = TryCopyInitialization(S, From->getInit(0), ToType,
                                      SuppressUserConversions,
                                      InOverloadResolution,
                                      AllowObjCWritebackConversion);
     //    - if the initializer list has no elements, the implicit conversion
     //      sequence is the identity conversion.
     else if (NumInits == 0) {
-      Result.setStandard();
-      Result.Standard.setAsIdentityConversion();
-      Result.Standard.setFromType(ToType);
-      Result.Standard.setAllToTypes(ToType);
+      Result.setAsIdentityConversion(ToType);
     }
     return Result;
   }
 
   // C++14 [over.ics.list]p8:
   // C++11 [over.ics.list]p7:
   //   In all cases other than those enumerated above, no conversion is possible
   return Result;