[libFuzzer] Enable extra counters for Fuchsia.

GitOrigin-RevId: a88591cff46645bd972a500ec83a0165602ecfa3
diff --git a/FuzzerExtraCounters.cpp b/FuzzerExtraCounters.cpp
index 3f38f4f..cd62394 100644
--- a/FuzzerExtraCounters.cpp
+++ b/FuzzerExtraCounters.cpp
@@ -11,7 +11,7 @@
 #include "FuzzerDefs.h"
 
 #if LIBFUZZER_LINUX || LIBFUZZER_NETBSD || LIBFUZZER_FREEBSD ||                \
-    LIBFUZZER_OPENBSD
+    LIBFUZZER_OPENBSD || LIBFUZZER_FUCHSIA
 __attribute__((weak)) extern uint8_t __start___libfuzzer_extra_counters;
 __attribute__((weak)) extern uint8_t __stop___libfuzzer_extra_counters;