* vm.c (RubyVM::FrameInfo): add a class to access each frame

  information.  You don't need to parse strings from caller().
  FrameInfo has the following methods:
  FrameInfo#name: method name, class name, etc with decorations.
  FrameInfo#basename: name without decorations.
  FrameInfo#line_no: line number.
  FrameInfo#filename: file name.
  FrameInfo#filepath: full filepath.
  FrameInfo#iseq: iseq if it is iseq frame (defined by ruby script)
  FrameInfo#to_s: return caller() method style string.
  RubyVM::FrameInfoFrameInfo.caller(n, lev) returns array of
  FrameInfo objects.  The name "RubyVM::FrameInfoFrameInfo.caller"
  is long and ambiguous (same as caller() method), we need to change
  the name before Ruby 2.0 release.
  Good names or comments are welcome.
* test/ruby/test_backtrace.rb: add a test for above change.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@35801 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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