This reverts commit d763c6e5e2d0a6b34097aa7dabca31e9aff9b0b6.

Adds the patch by @hans from
https://github.com/llvm/llvm-project/issues/62719
This patch fixes the Windows build.

d763c6e5e2d0a6b34097aa7dabca31e9aff9b0b6 reverted the reviews

D144509 [CMake] Bumps minimum version to 3.20.0.

This partly undoes D137724.

This change has been discussed on discourse
https://discourse.llvm.org/t/rfc-upgrading-llvms-minimum-required-cmake-version/66193

Note this does not remove work-arounds for older CMake versions, that
will be done in followup patches.

D150532 [OpenMP] Compile assembly files as ASM, not C

Since CMake 3.20, CMake explicitly passes "-x c" (or equivalent)
when compiling a file which has been set as having the language
C. This behaviour change only takes place if "cmake_minimum_required"
is set to 3.20 or newer, or if the policy CMP0119 is set to new.

Attempting to compile assembly files with "-x c" fails, however
this is workarounded in many cases, as OpenMP overrides this with
"-x assembler-with-cpp", however this is only added for non-Windows
targets.

Thus, after increasing cmake_minimum_required to 3.20, this breaks
compiling the GNU assembly for Windows targets; the GNU assembly is
used for ARM and AArch64 Windows targets when building with Clang.
This patch unbreaks that.

D150688 [cmake] Set CMP0091 to fix Windows builds after the cmake_minimum_required bump

The build uses other mechanism to select the runtime.

Fixes #62719

Reviewed By: #libc, Mordante

Differential Revision: https://reviews.llvm.org/D151344

This reverts commit 65429b9af6a2c99d340ab2dcddd41dab201f399c.

Broke several projects, see https://reviews.llvm.org/D144509#4347562 onwards.

Also reverts follow-up commit "[OpenMP] Compile assembly files as ASM, not C"

This reverts commit 4072c8aee4c89c4457f4f30d01dc9bb4dfa52559.

Also reverts fix attempt  "[cmake] Set CMP0091 to fix Windows builds after the cmake_minimum_required bump"

This reverts commit 7d47dac5f828efd1d378ba44a97559114f00fb64.

The owner of the last two failing buildbots updated CMake.

This reverts commit e8e8707b4aa6e4cc04c0cffb2de01d2de71165fc.

Unfortunatly not all buildbots are updated.

This reverts commit ffb807ab5375b3f78df198dc5d4302b3b552242f.

All build bots should be updated now.

This reverts commit 44d38022ab29a3156349602733b3459df5beef93.

This reverts commit 1ef4c3c859728008cf707cad8d67f45ae5070ae1.

Two buildbots still haven't been updated.

This reverts commit 92523a35a827539db8557bbc3ecab7f9ea3f6ade.

Reland to see whether CIs are updated.

This reverts commit a72165e5df59032cdd54dcb18155f2630d73abd1.

Some buildbots have not been updated yet.

This reverts commit 92523a35a827539db8557bbc3ecab7f9ea3f6ade.

Test whether all CI runners are updated.

Some build bots have not been updated to the new minimal CMake version.
Reverting for now and ping the buildbot owners.

This reverts commit 44c6b905f8527635e49bb3ea97dea315f92d38ec.