external/boringssl: Sync to 8ebeabf0e2e01b331e56d0a491c12539baa55d3d.

This includes the following changes:

https://boringssl.googlesource.com/boringssl/+log/be2ee342d3781ddb954f91f8a7e660c6f59e87e5..8ebeabf0e2e01b331e56d0a491c12539baa55d3d

Test: Libcore CTS presubmits.
Change-Id: I2fefc3e2bc2bbc3e3083668bd2a56d491520bc24
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 2abf616..844a140 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -221,8 +221,8 @@
     message(FATAL_ERROR "Cannot enable ASAN unless using Clang")
   endif()
 
-  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fsanitize=address -fno-omit-frame-pointer")
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=address -fno-omit-frame-pointer")
+  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fsanitize=address -fsanitize-address-use-after-scope -fno-omit-frame-pointer")
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=address -fsanitize-address-use-after-scope -fno-omit-frame-pointer")
   set(OPENSSL_NO_ASM "1")
 endif()