This patch fixes ICE causes by call stmt site hash going out of sync.  For
speculative edges it is assumed to contain a direct call so if we are
removing it hashtable needs to be updated.  I realize that the code is ugly
but I will leave cleanup for next stage1.

Bootstrapped/regtested x86_64-linux. This patch makes it possible to build
Firefox again.

	PR lto/93318
	* cgraph.c (cgraph_edge::resolve_speculation,
	cgraph_edge::redirect_call_stmt_to_callee): Fix update of
	call_stmt_site_hash.