Support assembly building for arm64e architecture.

iPhone XS/XS MAX/XR uses arm64e.

Change-Id: I89bd6b9307176c03fdc1a402ce6b8df080b00653
Reviewed-on: https://boringssl-review.googlesource.com/c/33224
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>

CMakeLists.txt

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9c4edba..dd2d937 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -408,6 +408,9 @@
   set(ARCH "aarch64")
 elseif(${CMAKE_SYSTEM_PROCESSOR} STREQUAL "arm64")
   set(ARCH "aarch64")
+# Apple A12 Bionic chipset which is added in iPhone XS/XS Max/XR uses arm64e architecture.
+elseif(${CMAKE_SYSTEM_PROCESSOR} STREQUAL "arm64e")
+  set(ARCH "aarch64")
 elseif(${CMAKE_SYSTEM_PROCESSOR} MATCHES "^arm*")
   set(ARCH "arm")
 elseif(${CMAKE_SYSTEM_PROCESSOR} STREQUAL "mips")