MIPS: Fix handling of spare long-range jump slots.

Contributed by Djordje Kovacevic and Stefan Pejic.

src/lj_jit.h

@@ -155,6 +155,12 @@ typedef uint8_t MCode;
 typedef uint32_t MCode;
 #endif
 
+/* Linked list of MCode areas. */
+typedef struct MCLink {
+  MCode *next;		/* Next area. */
+  size_t size;		/* Size of current area. */
+} MCLink;
+
 /* Stack snapshot header. */
 typedef struct SnapShot {
   uint16_t mapofs;	/* Offset into snapshot map. */