merge revision(s) 42905: [Backport #8884]
* vm_backtrace.c (vm_backtrace_to_ary): Ignore the second argument if it is nil. [Bug #8884] [ruby-core:57094] * test/ruby/test_backtrace.rb (test_caller_with_nil_length): Test for above.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@42925 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 42905: [Backport #8884]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@42925 b2dd03c8-39d4-4d8f-98ff-823fe69b080e