Allow mcode allocations outside of the jump range to the support code.

Thank you for your patience. #285

src/lj_emit_mips.h

@@ -80,6 +80,9 @@ static void emit_tsml(ASMState *as, MIPSIns mi, Reg rt, Reg rs, uint32_t msb,
 
 /* -- Emit loads/stores --------------------------------------------------- */
 
+#define jglofs(as, k) \
+  (((uintptr_t)(k) - (uintptr_t)J2G(as->J) - 32768) & 0xffff)
+
 /* Prefer rematerialization of BASE/L from global_State over spills. */
 #define emit_canremat(ref)	((ref) <= REF_BASE)