* eval.c (rb_longjmp): duplicate the thrown exception to set backtrace

  if it was frozen.  clear all raised flags.

* eval.c (stack_check): leave clearing flag to rb_longjmp.

* eval.c (rb_thread_set_raised, rb_thread_reset_raised): use generic
  flags.

* eval.c (Init_Proc), gc.c (Init_GC): freeze preallocated special exceptions.

* gc.c (rb_memerror): use thread raised flag instead of static flag,
  and raise nomem_error without backtrace if failed to make backtrace.
  [ruby-dev:34724]

* gc.c (ruby_xmalloc): increase malloc_increase only if malloc
  succeeds.  failed malloc size can be huge.  it may increase
  malloc_limit too big which cause less GC and memory full.
  (ruby_xrealloc): ditto.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@17832 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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