Add a missing colon. Noticed by Jeff Cohen.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32796 91177308-0d34-0410-b5e6-96231b3b80d8

lib/AsmParser/llvmAsmParser.y

@@ -2437,6 +2437,7 @@ IndexList       // Used for gep instructions and constant expressions
     $$->push_back($3);
     CHECK_FOR_ERROR
   }
+  ;
 
 OptTailCall : TAIL CALL {
     $$ = true;