Add LJ_TARGET_UNALIGNED.

src/lj_arch.h

@@ -131,6 +131,7 @@
 #define LJ_TARGET_EHRETREG	0
 #define LJ_TARGET_MASKSHIFT	1
 #define LJ_TARGET_MASKROT	1
+#define LJ_TARGET_UNALIGNED	1
 #define LJ_ARCH_NUMMODE		LJ_NUMMODE_SINGLE_DUAL
 
 #elif LUAJIT_TARGET == LUAJIT_ARCH_X64
@@ -145,6 +146,7 @@
 #define LJ_TARGET_JUMPRANGE	31	/* +-2^31 = +-2GB */
 #define LJ_TARGET_MASKSHIFT	1
 #define LJ_TARGET_MASKROT	1
+#define LJ_TARGET_UNALIGNED	1
 #define LJ_ARCH_NUMMODE		LJ_NUMMODE_SINGLE_DUAL
 
 #elif LUAJIT_TARGET == LUAJIT_ARCH_ARM
@@ -388,6 +390,10 @@
 #define LJ_64			1
 #endif
 
+#ifndef LJ_TARGET_UNALIGNED
+#define LJ_TARGET_UNALIGNED	0
+#endif
+
 /* Various workarounds for embedded operating systems. */
 #if defined(__ANDROID__) || defined(__symbian__)
 #define LUAJIT_NO_LOG2

src/lj_opt_fold.c

@@ -1800,7 +1800,7 @@ LJFOLDF(merge_eqne_snew_kgc)
   int32_t len = (int32_t)kstr->len;
   lua_assert(irt_isstr(fins->t));
 
-#if LJ_TARGET_X86ORX64
+#if LJ_TARGET_UNALIGNED
 #define FOLD_SNEW_MAX_LEN	4  /* Handle string lengths 0, 1, 2, 3, 4. */
 #define FOLD_SNEW_TYPE8		IRT_I8	/* Creates shorter immediates. */
 #else