tree 6f7af2bcda83be26344a44eb7c38d5a60dd71669
parent 6b65fb6d936b4b570615201f4f81c8c594717ec7
author erifan01 <eric.fang@arm.com> 1575961374 +0800
committer Than McIntosh <thanm@google.com> 1578659913 +0000

gollvm: add linux arm64 support

This CL adds linux arm64 support for Gollvm, with this patch we can build and
run Go programs with Gollvm on linux arm64.

The main changes include:
1, ARM_AAPCS64 ABI implementation (some features are not implemented, such
   as HVA, Unions and Bit-fields).
2, port all of the existing unit test cases on amd64 to arm64.

It should be emphasized that since ld.gold does not support stack split on
linux arm64, we must specify the cmake parameter -DGOLLVM_USE_SPLIT_STACK=OFF
when building. Besides, there are a few go tool and standard package test
failures. Next we will fix these failures in the follow up patches.

Change-Id: I020573ee437f182e26c03b444b080d497f4245c3
Reviewed-on: https://go-review.googlesource.com/c/gollvm/+/213998
Reviewed-by: Than McIntosh <thanm@google.com>