1. Add ARM64 Windows on Arm buildbots (details)
Commit 2800bc5c7c1f9efc5e8733ef4d56963758ef24d7 by maxim.kuvyrkov
Add ARM64 Windows on Arm buildbots

This patch adds 2 new machines:
* linaro-armv8-windows-msvc-01
* linaro-armv8-windows-msvc-02
and 2 new builders:
* clang-arm64-windows-msvc
* clang-arm64-windows-msvc-2stage
to test LLVM on Windows on Arm platform.

The machines are Microsoft Surface X Pro laptops configured for 24x7 workload.

The host build environment is bootstrapped based on LLVM 11 custom build and
uses headers and libraries from MS Visual Studio 2019.  To accommodate the custom
setup we add "manual" value for "vs" parameter to ClangBuilder factory, which allows
to use manually pre-configured MSVC environment instead of initializing it during
build by running old-school vcvarsall.bat.

Finally, the bots have known failures in MCJIT unit-tests, which we are working on.
Once the failures are fixed, we'll enable unit-testsuite in both builders.

Reviewed By: gkistanova, omjavaid

Differential Revision:
The file was modifiedzorg/buildbot/builders/ (diff)
The file was modifiedbuildbot/osuosl/master/config/ (diff)
The file was modifiedbuildbot/osuosl/master/config/ (diff)