* cprop.c (struct expr): Split 'expr' field in 'dest' and 'src'.
	(expr_equiv_p): Remove.
	(insert_set_in_table): Look at <dest, src> pair instead of expr.
	(hash_scan_set): Update call to insert_set_in_table.
	(dump_hash_table): Dump <dest, src> pair.
	(lookup_set): Simplify.  Lookup <dest, src> pair.
	(compute_transp): Remove, fold heavily simplified code into...
	(compute_local_properties): ...here.  Expect COMP and TRANSP
	unconditionally.
	(find_avail_set): Take set directly from struct expr.
	(find_bypass-set): Likewise.
	(bypass_block): Likewise.
	(cprop_insn): Likewise.  Remove redundant INSN_P test.

From-SVN: r171947