cfgrtl.c (can_fallthru): Reorder code to move tablejump check up.

cfgrtl.c (can_fallthru): Reorder code to move tablejump check up.

	* cfgrtl.c (can_fallthru): Reorder code to move tablejump check up.
	Make that check explicit.  BB_HEAD cannot be NULL, remove check for it.
	* haifa-sched.c (ready_remove_first_dispatch): Check INSN_P before
	looking at INSN_CODE.
	* reload1.c (delete_dead_insn) Do not expect JUMP_TABLE_DATA to be an
	active_insn_p object, respect basic block boundaries.
	* reorg.c (follow_jumps): Use invariant that JUMP_TABLE_DATA always
	follows immediately after the jump table data label.
	* config/nds32/nds32.c (nds32_output_casesi_pc_relative): Likewise.
	* config/sh/sh.c (barrier_align): Likewise.  Rearrange code such
	that JUMP_TABLE_DATA is not expected to be an active_insn_p object.

From-SVN: r204758