Merge pull request #29816 from rintaro/ide-completion-rdar59344203

[CodeCompletion] Fix a crash in context type analysis

Author: rintaro

lib/IDE/ExprContextAnalysis.cpp

@@ -647,7 +647,8 @@ class ExprContextAnalyzer {
     }
     case ExprKind::If: {
       auto *IE = cast<IfExpr>(Parent);
-      if (SM.rangeContains(IE->getCondExpr()->getSourceRange(),
+      if (IE->isFolded() &&
+          SM.rangeContains(IE->getCondExpr()->getSourceRange(),
                            ParsedExpr->getSourceRange())) {
         recordPossibleType(Context.getBoolDecl()->getDeclaredInterfaceType());
         break;