Recoverable GWP-ASan: Don't tell ActivityManager

Currently, debuggerd tells the teacher that an app that received a fatal
signal. On the playground, dobbing on a process that doesn't actually
need to be killed is considered a friendship-ending move.

Because recoverable GWP-ASan is *supposed* to not crash your app,
suppress this behaviour and don't let ActivityManager know about the
crash.

Bug: N/A
Test: Run a use-after-free in an app that's using recoverable GWP-ASan,
through the 'libc.debug.gwp_asan.recoverable.<app_name>=1' and
'libc.debug.gwp_asan.process_sampling.<app_name>=1' sysprops.

Change-Id: I033ea67d577573df10936e37db7302d4f4bc0069
diff --git a/debuggerd/protocol.h b/debuggerd/protocol.h
index e7cb218..b60cf5b 100644
--- a/debuggerd/protocol.h
+++ b/debuggerd/protocol.h
@@ -99,6 +99,7 @@
   uintptr_t scudo_region_info;
   uintptr_t scudo_ring_buffer;
   size_t scudo_ring_buffer_size;
+  bool recoverable_gwp_asan_crash;
 };
 
 struct __attribute__((__packed__)) CrashInfo {