* 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.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@23818 138bc75d-0d04-0410-961f-82ee72b054a4