[ConstraintSystem] Extend metatype instance type mismatch coverage

Originally type mismatches associated with metatypes were only covered
for coercions but fix coverage grew since then and now it makes sense
to remove special case and let `repairFailures` take care of it.

Author: xedin

lib/Sema/CSSimplify.cpp

@@ -4068,16 +4068,12 @@ ConstraintSystem::matchTypes(Type type1, Type type2, ConstraintKind kind,
       auto result =
           matchTypes(instanceType1, instanceType2, subKind, subflags,
                      locator.withPathElement(ConstraintLocator::InstanceType));
-      if (shouldAttemptFixes() && result.isFailure()) {
-        auto *anchor = locator.getAnchor();
-        if (anchor && isa<CoerceExpr>(anchor)) {
-          auto *fix =
-              ContextualMismatch::create(*this, instanceType1, instanceType2,
-                                         getConstraintLocator(locator));
-          conversionsOrFixes.push_back(fix);
-          break;
-        }
-      }
+
+      // If matching of the instance types resulted in the failure make sure
+      // to give `repairFailure` a chance to run to attempt to fix the issue.
+      if (shouldAttemptFixes() && result.isFailure())
+        break;
+
       return result;
     }