envutil.rb: fix argument order

* test/ruby/envutil.rb (Test::Test#assert_warning): fix expected
  and actual results order.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47169 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
test_parse.rb: for warnings

* test/ruby/test_parse.rb (TestParse): add tests for parser warnings.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47170 b2dd03c8-39d4-4d8f-98ff-823fe69b080e