Enable shared dictionary for quality 4 hasher H54.

PiperOrigin-RevId: 994686335

c/enc/backward_references.c

diff --git a/c/enc/backward_references.c b/c/enc/backward_references.c
index 1a7d3d0..ba4f6e6 100644
--- a/c/enc/backward_references.c
+++ b/c/enc/backward_references.c
@@ -236,6 +236,10 @@
 /* NOLINTNEXTLINE(build/include) */
 #include "backward_references_inc.h"
 #undef HASHER
+#define HASHER() H54
+/* NOLINTNEXTLINE(build/include) */
+#include "backward_references_inc.h"
+#undef HASHER
 #define HASHER() H5
 /* NOLINTNEXTLINE(build/include) */
 #include "backward_references_inc.h"
@@ -303,6 +307,7 @@
         return;
       CASE_(3)
       CASE_(4)
+      CASE_(54)
       CASE_(5)
       CASE_(6)
 #if defined(BROTLI_MAX_SIMD_QUALITY)