In a SIL function body, lex %42 as a new sil_local_name token.

Swift SVN r5261

include/swift/Parse/Token.h

@@ -35,6 +35,7 @@ enum class tok {
   floating_literal,
   string_literal,
   character_literal,
+  sil_local_name,      // %42 in SIL mode.
   
 #define KEYWORD(X) kw_ ## X,
 #define PUNCTUATOR(X, Y) X,

include/swift/Parse/Tokens.def

@@ -102,6 +102,7 @@ PUNCTUATOR(question,      "?")
 PUNCTUATOR(sil_at_sign,   "@")    // Only in SIL mode.
 PUNCTUATOR(sil_dollar,    "$")    // Only in SIL mode.
 
+
 #undef KEYWORD
 #undef IDENTIFIER_KEYWORD
 #undef PUNCTUATOR