Restrict creation of bootreceiver tracing instance to 64-bit systems.

The main users of this instance are KFENCE and MTE-aided KASAN, which are only supported on arm64.
Skip creation of this tracing instance on 32-bit systems to save ~6Mb memory on low-end devices.

Bug: 195089948
Bug: 194719088
Bug: 194156700
Test: manual on Pixel device
Merged-In: Icaf762715fed7a282b1ad738c10bcb45dc848f4d
Change-Id: I61694ce174fa745ef9fd50ca7464b5a9e1d1e011
(cherry picked from commit c81fec7d8eda91bdbbed87606bd3c844b5605214)
diff --git a/rootdir/init.rc b/rootdir/init.rc
index 376a678..d10689a 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -590,9 +590,10 @@
     # Load trusted keys from dm-verity protected partitions
     exec -- /system/bin/fsverity_init --load-verified-keys
+on late-fs && property:ro.product.cpu.abilist64=*
     # Set up a tracing instance for system_server to monitor error_report_end events.
     # These are sent by kernel tools like KASAN and KFENCE when a memory corruption
-    # is detected.
+    # is detected. This is only needed for 64-bit systems.
     mkdir /sys/kernel/tracing/instances/bootreceiver 0700 system system
     restorecon_recursive /sys/kernel/tracing/instances/bootreceiver
     write /sys/kernel/tracing/instances/bootreceiver/buffer_size_kb 1