* vm.c: refactoring backtrace related funcitons.

  (1) unify similar functions (rb_backtrace_each() and
  backtrace_object()).  backtrace_each() is a unified function.
  variation:
  a) backtrace_object(): create backtrace object.
  b) vm_backtrace_str_ary(): create bt as an array of string.
  c) vm_backtrace_print(): print backtrace to specified file.
  d) rb_backtrace_print_as_bugreport(): print backtrace on
  bugreport style.
  (2) remove rb_backtrace_each().  Use backtrace_each() instead.
  (3) chang the type of lev parameter to size_t.
  a) lev == 0 means current frame (exception, etc use it).
  b) lev == 1 means upper frame (caller(0) use it).
* vm_core.h, vm_dump.c, vm_eval.c: ditto.
* vm.c (backtrace_object(), vm_backtrace_str_ary()): fix to return a
  correct size of caller(lev) array.
  Let n be a "caller(0).size" then ln as caller(lev).size should be
  (n - lev).  However, the previous implementation returns a wrong
  size array (ln > n - lev).  [ruby-dev:45673]
* test/ruby/test_backtrace.rb: add tests for backtrace.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@35787 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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