Symbol#inspect for non-US-ASCII symbols

[simonrussell]

Seems that US-ASCII is hard-coded somewhere for Symbol#inspect.

MRI 1.9.3-p484, 2.0.0-p353, 2.1.0:
:"\u1234".inspect
=> ":ሴ"

JRuby 1.7.11:
:"\u1234".inspect
ArgumentError: invalid byte sequence in US-ASCII
from org/jruby/RubySymbol.java:264:in inspect' from org/jruby/RubySymbol.java:253:ininspect'
from (irb):1:in evaluate' from org/jruby/RubyKernel.java:1121:ineval'
from org/jruby/RubyKernel.java:1521:in loop' from org/jruby/RubyKernel.java:1284:incatch'
from org/jruby/RubyKernel.java:1284:in catch' from /home/simon/.rvm/rubies/jruby-1.7.11/bin/irb:13:in(root)'

[k77ch7]

This works on master and jruby-1_7. This is duplicate of #2172.

[simonrussell]

I'd argue that the other bug is a duplicate of this one :) But either way, it's great to see this fixed, thanks.