Plumb scudo_ring_buffer_size to debuggerd_process_info

This is a no-op but will be used in upcoming scudo changes that allow to
change the buffer size at process startup time, and as such we will no
longer be able to call __scudo_get_ring_buffer_size in debuggerd.

Bug: 263287052
Change-Id: I18f166fc136ac8314d748eb80a806defcc25c9fd
diff --git a/libc/bionic/malloc_common_dynamic.cpp b/libc/bionic/malloc_common_dynamic.cpp
index 97e8d15..802a94f 100644
--- a/libc/bionic/malloc_common_dynamic.cpp
+++ b/libc/bionic/malloc_common_dynamic.cpp
@@ -371,6 +371,7 @@
 extern "C" const char* __scudo_get_stack_depot_addr();
 extern "C" const char* __scudo_get_region_info_addr();
 extern "C" const char* __scudo_get_ring_buffer_addr();
+extern "C" size_t __scudo_get_ring_buffer_size();
 
 // Initializes memory allocation framework once per process.
 static void MallocInitImpl(libc_globals* globals) {
@@ -383,6 +384,7 @@
   __libc_shared_globals()->scudo_stack_depot = __scudo_get_stack_depot_addr();
   __libc_shared_globals()->scudo_region_info = __scudo_get_region_info_addr();
   __libc_shared_globals()->scudo_ring_buffer = __scudo_get_ring_buffer_addr();
+  __libc_shared_globals()->scudo_ring_buffer_size = __scudo_get_ring_buffer_size();
 #endif
 
   // Prefer malloc debug since it existed first and is a more complete