re PR rtl-optimization/5854 (initialize_uninitialized_subregs() breaks HC11/HC12...

re PR rtl-optimization/5854 (initialize_uninitialized_subregs() breaks HC11/HC12 port)

	PR optimization/5854
	* config/m68hc11/m68hc11.h (CONST_OK_FOR_LETTER_VALUE_P): Use K for 0.
	Shut up warnings.
	(CONST_DOUBLE_OK_FOR_LETTER_P): Use G for 0.0.
	(EXTRA_CONSTRAINT): Use S for non-push memory operand.
	* config/m68hc11/m68hc11.c (m68hc11_split_move): Handle setting from
	const0 if scratch register was not allocated.
	(m68hc11_reload_operands, m68hc11_gen_lowpart, m68hc11_gen_highpart,
	m68hc11_z_replacement): Replace gen_rtx (CONST_INT, VOIDmode, ...)
	with GEN_INT (...).
	(m68hc11_reorg): Compute BLOCK_FOR_INSN before reload_cse_regs.
	* config/m68hc11/m68hc11.md: Replace gen_rtx (CONST_INT, VOIDmode, ...)
	with GEN_INT (...) everywhere.  Remove constraints in define_split
	patterns.
	(movdi_internal, movdf_internal, movsi_internal, movsf_internal): Don't
	require scratch register for setting 0 into regs/non-pushable memory.

From-SVN: r51194