Merge pull request #16150 from slavapestov/irgen-review-feedback

IRGen: CompletelyFragileScope constructor should be explicit

Author: slavapestov

lib/IRGen/GenType.h

@@ -225,7 +225,7 @@ class CompletelyFragileScope {
   bool State;
   TypeConverter &TC;
 public:
-  CompletelyFragileScope(TypeConverter &TC) : TC(TC) {
+  explicit CompletelyFragileScope(TypeConverter &TC) : TC(TC) {
     State = TC.isCompletelyFragile();
     if (!State)
       TC.pushCompletelyFragile();