tree 27bb89a57e69a992026e2e700c7fb74d52cf609d
parent ddfcd42b2527ec7e66dd310ee074d0343d8a06ee
author Peter Collingbourne <pcc@google.com> 1540422587 -0700
committer Peter Collingbourne <pcc@google.com> 1540424449 +0000

Prevent clang from using the x18 register on arm64.

This is achieved via the compiler flag -ffixed-x18 for non-LTO builds
and the linker flag -plugin-opt -mattr=+reserve-x18 for LTO builds.

This change should be reverted once we upgrade past LLVM r340889
which does this by default on Android.

Bug: 112907825
Bug: 111759196
Change-Id: I05473ddbb98319d87d442425b4d715647eae3a38