Add basic lexing and parsing support for SSA operands and definitions.  This
isn't actually constructing IR objects yet, it is eating the tokens and
discarding them.

PiperOrigin-RevId: 203616265
diff --git a/lib/Parser/Lexer.h b/lib/Parser/Lexer.h
index 4bbd9b7..730bbc9 100644
--- a/lib/Parser/Lexer.h
+++ b/lib/Parser/Lexer.h
@@ -60,7 +60,7 @@
   Token lexComment();
   Token lexBareIdentifierOrKeyword(const char *tokStart);
   Token lexAtIdentifier(const char *tokStart);
-  Token lexAffineMapId(const char *tokStart);
+  Token lexPrefixedIdentifier(const char *tokStart);
   Token lexNumber(const char *tokStart);
   Token lexString(const char *tokStart);
 };