libgcc2.c (top_elt): Remove top_elt, it isn't thread safe.

libgcc2.c (top_elt): Remove top_elt, it isn't thread safe.

	* libgcc2.c (top_elt): Remove top_elt, it isn't thread safe.
	The strategy we now use is to pre allocate the top_elt along
	with the EH context so that each thread has its own top_elt.
	This is necessary as the dynmanic cleanup chain is used on the
	top element of the stack and each thread MUST have its own.
	(eh_context_static): Likewise.
	(new_eh_context): Likewise.
	(__sjthrow): Likewise.

From-SVN: r23818