Add code to calculate code buffer size based on devel time information.

* lib/jit_aarch64-sz.c, lib/jit_arm-sz.c, lib/jit_hppa-sz.c,
	lib/jit_ia64-sz.c, lib/jit_mips-sz.c, lib/jit_ppc-sz.c,
	lib/jit_s390x-sz.c, lib/jit_size.c, lib/jit_sparc-sz.c,
	lib/jit_x86-sz.c: New files implementing static tables
	with longest known instructions length generated to match
	a lightning instruction. These tables should make it easier
	to make it very unlikely to ever miscalculate, or by too
	much, the size of a code buffer.

	* lib/jit_size.c: New file that aids to either collect
	jit code size information, or use the information depending
	on build options.

	* size.c: New helper file that parses input for, and create
	an initial jit_$arch-sz.c file, that needs some minor edit
	for arches with multiple configurations.

	* configure.ac, Makefile.am: Add the new, devel mode only
	--enable-devel-get-jit-size configure option, that sets
	compile time flags to collect jit code size information,
	that will be used as input for the "noinst size program".

	* lib/jit_aarch64.c, lib/jit_arm.c, lib/jit_disasm.c,
	lib/jit_hppa.c, lib/jit_ia64.c, lib/jit_memory.c,
	lib/jit_mips.c, lib/jit_ppc.c, lib/jit_s390x.c,
	lib/jit_sparc.c, lib/jit_x86.c, lib/lightning.c: Minor
	changes for the --enable-devel-get-jit-size build mode,
	as well as the "production build mode" with jit code
	size information.

lib/jit_mips.c

@@ -972,7 +972,7 @@ _emit_code(jit_state_t *_jit)
 		}							\
 		break
     for (node = _jitc->head; node; node = node->next) {
-	if (_jit->pc.uc >= _jitc->code.end && !jit_remap())
+	if (_jit->pc.uc >= _jitc->code.end)
 	    return (NULL);
 
 	value = jit_classify(node->code);