Modify the type of line-number to uint16_t. Type short is not portable. And it...

Modify the type of line-number to uint16_t. Type short is not portable. And it cannot be more than UINT16_MAX because of the mrbc binary format.

include/mruby/irep.h

@@ -23,7 +23,7 @@ typedef struct mrb_irep {
 
   /* debug info */
   const char *filename;
-  short *lines;
+  uint16_t *lines;
 
   size_t ilen, plen, slen;
 } mrb_irep;

src/codegen.c

@@ -2401,7 +2401,7 @@ scope_finish(codegen_scope *s)
     irep->iseq = (mrb_code *)codegen_realloc(s, s->iseq, sizeof(mrb_code)*s->pc);
     irep->ilen = s->pc;
     if (s->lines) {
-      irep->lines = (short *)codegen_realloc(s, s->lines, sizeof(short)*s->pc);
+      irep->lines = (uint16_t *)codegen_realloc(s, s->lines, sizeof(uint16_t)*s->pc);
     }
     else {
       irep->lines = 0;

src/load.c

@@ -226,7 +226,7 @@ read_rite_lineno_record(mrb_state *mrb, const uint8_t *bin, size_t irepno, uint3
   int ret;
   size_t i, fname_len, niseq;
   char *fname;
-  short *lines;
+  uint16_t *lines;
 
   ret = MRB_DUMP_OK;
   *len = 0;
@@ -249,7 +249,7 @@ read_rite_lineno_record(mrb_state *mrb, const uint8_t *bin, size_t irepno, uint3
   bin += sizeof(uint32_t); // niseq
   *len += sizeof(uint32_t);
 
-  lines = (short *)mrb_malloc(mrb, niseq * sizeof(short));
+  lines = (uint16_t *)mrb_malloc(mrb, niseq * sizeof(uint16_t));
   for (i = 0; i < niseq; i++) {
     lines[i] = bin_to_uint16(bin);
     bin += sizeof(uint16_t); // niseq