Revert "Revert "soong: upgrade Android platform to clang-r370808""

This reverts commit 862eb464.

Re-upgrades the compiler to clang-r370808, after first dealing with
regressions in ndk_translate and execute only pages.

Bug: 139945549
Bug: 145807809
Bug: 145827049
Bug: 145825270
Test: atest \
  CtsSelinuxTargetSdk27TestCases:android.security.SELinuxTargetSdkTest#testNoExecuteOnly
Test: m ndk_translation_host_unit_tests && \
  ./out/host/linux-x86/nativetest/ndk_translation_host_unit_tests/ndk_translation_host_unit_tests
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Change-Id: I714b582faffa8c92384818a7b12338d621968548