ext/coverage/coverage.c: add Coverage.enabled?
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59716 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
ext/coverage/coverage.c: add Coverage.enabled?
check if coverage is enabled. patched by Burke Libbey in [ruby-core:81726]. [Feature #13667]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59716 b2dd03c8-39d4-4d8f-98ff-823fe69b080e