[Parser] Reset ASTScopes before performing the IDEInspection second pass.

IDE inspection can delay parsing of particular declarations, so expanding
ASTScopes during the first pass will miss those declarations. Clear any
expanded scopes to force re-expansion during the second pass.

(cherry picked from commit 51e1a39)

Author: hborla

lib/Parse/Parser.cpp

@@ -154,6 +154,9 @@ void Parser::performIDEInspectionSecondPassImpl(
   // discriminators.
   Context.evaluator.clearCachedOutput(LocalDiscriminatorsRequest{DC});
 
+  // Clear any ASTScopes that were expanded.
+  SF.clearScope();
+
   switch (info.Kind) {
   case IDEInspectionDelayedDeclKind::TopLevelCodeDecl: {
     // Re-enter the top-level code decl context.