vm_dump.c: important message first

* vm_dump.c (rb_vm_bugreport): show the most important message, Crash
  Report log information, first.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38990 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ruby/test_rubyoptions.rb

@@ -485,6 +485,7 @@ class TestRubyOptions < Test::Unit::TestCase
       %r(\A
       -e:(?:1:)?\s\[BUG\]\sSegmentation\sfault\n
       #{ Regexp.quote(RUBY_DESCRIPTION) }\n\n
+      (?:--\s(?:.+\n)*\n)?
       --\sControl\sframe\sinformation\s-+\n
       (?:c:.*\n)*
       (?: