Merge pull request #25296 from broadwaylamb/patch-2

[Parse] Add missing const qualifier to getSplitTokens()

Author: rintaro

include/swift/Parse/Parser.h

@@ -183,7 +183,7 @@ class Parser {
 
   bool allowTopLevelCode() const;
 
-  const std::vector<Token> &getSplitTokens() { return SplitTokens; }
+  const std::vector<Token> &getSplitTokens() const { return SplitTokens; }
 
   void markSplitToken(tok Kind, StringRef Txt);