load.c: avoid segfault when 'throw' occurs in the middle of rb_load_file_str

How can a 'throw' happen while the current thread is reading a Ruby source file
from disk and parsing it? It can happen if another thread calls Thread#raise,
and passes an Exception object which responds to #exception, and the custom #exception
method calls Kernel#throw.

In practice, this is most likely to happen if you combine the use of autoload and
Timeout.timeout.

An extra check is required to avoid a segfault in this case.

* load.c (rb_load_internal0): extra check before returning TAG_RAISE when a
  non-local transfer of control happens while loading and parsing a Ruby source file.
  [ruby-core:70169] [Bug #11404]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51439 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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