[Parser] Minor location tweak to aid the scope map.

Author: DougGregor

lib/Parse/ParseStmt.cpp

@@ -2213,7 +2213,7 @@ ParserResult<Stmt> Parser::parseStmtForCStyle(SourceLoc ForLoc,
   // If we're missing a semicolon, try to recover.
   if (Tok.isNot(tok::semi)) {
     // Provide a reasonable default location for the first semicolon.
-    Semi1Loc = Tok.getLoc();
+    Semi1Loc = PreviousLoc;
 
     if (auto *BS = ConvertClosureToBraceStmt(First.getPtrOrNull(), Context)) {
       // We have seen:

test/Parse/toplevel_library_invalid.swift

@@ -1,4 +1,5 @@
 // RUN: %target-parse-verify-swift -parse-as-library
+// RUN: %target-parse-verify-swift -parse-as-library -enable-astscope-lookup
 
 let x = 42 // expected-note{{did you mean 'x'?}}
 x + x; // expected-error {{expressions are not allowed at the top level}} expected-warning {{result of operator '+' is unused}}