Fix up symbols that look like cvar/ivar/gvar in ripper translation

Author: kddnewton

lib/prism/translation/ripper.rb

@@ -2721,6 +2721,12 @@ def visit_token(token)
           on_ident(token)
         when /^[[:upper:]]/
           on_const(token)
+        when /^@@/
+          on_cvar(token)
+        when /^@/
+          on_ivar(token)
+        when /^\$/
+          on_gvar(token)
         when /^[[:punct:]]/
           on_op(token)
         else

test/prism/ripper_test.rb

@@ -25,7 +25,6 @@ class RipperTest < TestCase
       dos_endings.txt
       embdoc_no_newline_at_end.txt
       endless_methods.txt
-      global_variables.txt
       hashes.txt
       heredocs_leading_whitespace.txt
       heredocs_nested.txt
@@ -89,7 +88,6 @@ class RipperTest < TestCase
       single_method_call_with_bang.txt
       spanning_heredoc.txt
       strings.txt
-      symbols.txt
       ternary_operator.txt
       tilde_heredocs.txt
       unless.txt