9. reduce sizeof(match_context)

On 32 bit platform, 36 bytes -> 32 bytes.
On 64 bit platform, 72 bytes -> 64 bytes.

ctx->toplevel is used as a boolean type.
ctx->jump's possible value is below:

#define JUMP_NONE            0
#define JUMP_MAX_UNTIL_1     1
#define JUMP_MAX_UNTIL_2     2
#define JUMP_MAX_UNTIL_3     3
#define JUMP_MIN_UNTIL_1     4
#define JUMP_MIN_UNTIL_2     5
#define JUMP_MIN_UNTIL_3     6
#define JUMP_REPEAT          7
#define JUMP_REPEAT_ONE_1    8
#define JUMP_REPEAT_ONE_2    9
#define JUMP_MIN_REPEAT_ONE  10
#define JUMP_BRANCH          11
#define JUMP_ASSERT          12
#define JUMP_ASSERT_NOT      13

Author: wjssz

Modules/sre_lib.h

@@ -529,8 +529,6 @@ do { \
     DO_JUMPX(jumpvalue, jumplabel, nextpattern, 0)
 
 typedef struct {
-    Py_ssize_t last_ctx_pos;
-    Py_ssize_t jump;
     SRE_CHAR* ptr;
     SRE_CODE* pattern;
     Py_ssize_t count;
@@ -540,7 +538,9 @@ typedef struct {
         SRE_CODE chr;
         SRE_REPEAT* rep;
     } u;
-    int toplevel;
+    Py_ssize_t last_ctx_pos;
+    int8_t jump;
+    int8_t toplevel;
 } SRE(match_context);
 
 /* check if string matches the given pattern.  returns <0 for
@@ -551,8 +551,8 @@ SRE(match)(SRE_STATE* state, SRE_CODE* pattern, int toplevel)
     SRE_CHAR* end = (SRE_CHAR *)state->end;
     Py_ssize_t alloc_pos, ctx_pos = -1;
     Py_ssize_t i, ret = 0;
-    Py_ssize_t jump;
     unsigned int sigcount=0;
+    int8_t jump;
 
     SRE(match_context)* ctx;
     SRE(match_context)* nextctx;