[CodeCompletion] Add type relation indicators to completion results at the conditions of repeat-while statements.

Boolean expressions should have higher priority at loop conditions.

lib/IDE/CodeCompletion.cpp

@@ -4186,6 +4186,7 @@ public:
         switch (S->getKind()) {
         case StmtKind::Return:
         case StmtKind::ForEach:
+        case StmtKind::RepeatWhile:
           return true;
         default:
           return false;
@@ -4249,6 +4250,15 @@ public:
          }
          break;
        }
+       case StmtKind::RepeatWhile: {
+         auto Cond = cast<RepeatWhileStmt>(Parent)->getCond();
+         if (Cond &&
+             SM.rangeContains(Cond->getSourceRange(),
+                              ParsedExpr->getSourceRange())) {
+           Callback(Context.getBoolDecl()->getDeclaredType());
+         }
+         break;
+       }
        default:
          llvm_unreachable("Unhandled statement kinds.");
      }