merged repcode search into BT match search

this version has same speed as branch `opt`
which is itself 5-10% slower than branch `dev`
(no identified reason)

It does not compress exactly the same as `opt` or `dev`,
maybe because it doesn't stop search after repcodes,
leading to sometimes better compression, sometimes worse
(by a small margin).

warning : _extDict path does not work for the time being
This means that benchmark module works,
but file module will fail with large files (and high compression level).
Objective is to fuse _extDict path into current one,
in order to have a single parser to maintain.

lib/common/zstd_internal.h

@@ -54,6 +54,7 @@ extern "C" {
 
 #if defined(ZSTD_DEBUG) && (ZSTD_DEBUG>=2)
 #  include <stdio.h>
+extern int g_debuglog_enable;
 /* recommended values for ZSTD_DEBUG display levels :
  * 1 : no display, enables assert() only
  * 2 : reserved for currently active debugging path
@@ -61,11 +62,11 @@ extern "C" {
  * 4 : events once per frame
  * 5 : events once per block
  * 6 : events once per sequence (*very* verbose) */
-#  define DEBUGLOG(l, ...) {                         \
-                if (l<=ZSTD_DEBUG) {                 \
-                    fprintf(stderr, __FILE__ ": ");  \
-                    fprintf(stderr, __VA_ARGS__);    \
-                    fprintf(stderr, " \n");          \
+#  define DEBUGLOG(l, ...) {                                 \
+                if ((g_debuglog_enable) & (l<=ZSTD_DEBUG)) { \
+                    fprintf(stderr, __FILE__ ": ");          \
+                    fprintf(stderr, __VA_ARGS__);            \
+                    fprintf(stderr, " \n");                  \
             }   }
 #else
 #  define DEBUGLOG(l, ...)      {}    /* disabled */
@@ -89,9 +90,7 @@ extern "C" {
 #define ZSTD_OPT_NUM    (1<<12)
 
 #define ZSTD_REP_NUM      3                 /* number of repcodes */
-#define ZSTD_REP_CHECK    (ZSTD_REP_NUM)    /* number of repcodes to check by the optimal parser */
 #define ZSTD_REP_MOVE     (ZSTD_REP_NUM-1)
-#define ZSTD_REP_MOVE_OPT (ZSTD_REP_NUM)
 static const U32 repStartValue[ZSTD_REP_NUM] = { 1, 4, 8 };
 
 #define KB *(1 <<10)