microsoft/compiler: use nir_shader_add_variable

Now that we're using the right variable-mode, this is the same, and
prepares us a bit more for the future where all variables will be in the
same list.
25 jobs for msclc-d3d12 in 9 minutes and 15 seconds (queued for 4 seconds)
latest
Status Job ID Name Coverage
  Container
passed #5471457
aarch64
arm_build

00:00:21

passed #5471458
aarch64
arm_test

00:00:21

passed #5471459
windows shell 1809 mesa
windows_build_vs2019

00:00:21

passed #5471453
x86_build

00:00:24

passed #5471456
x86_build_old

00:00:28

passed #5471454
x86_test-gl

00:00:26

passed #5471455
x86_test-vk

00:00:27

 
  Meson X86 64
passed #5471463
meson-clang

00:08:27

passed #5471462
meson-classic

00:03:29

passed #5471464
meson-clover

00:07:56

passed #5471465
meson-clover-old-llvm

00:05:32

passed #5471461
meson-gallium

00:08:01

passed #5471460
meson-testing

00:06:45

passed #5471466
meson-vulkan

00:04:55

 
  Scons
passed #5471467
scons-win64

00:08:47

 
  Meson Misc
passed #5471469
aarch64
meson-arm64

00:05:43

passed #5471470
aarch64
meson-arm64-build-test

00:05:43

passed #5471468
aarch64
meson-armhf

00:06:23

passed #5471472
meson-i386

00:05:27

passed #5471475
meson-mingw32-x86_64

00:05:33

passed #5471474
kvm
meson-ppc64el

00:05:06

passed #5471473
kvm
meson-s390x

00:05:11

passed #5471471
windows docker 1809 mesa
meson-windows-vs2019

00:04:55

 
  Radv
manual #5471477
polaris10 manual
radv-polaris10-traces
manual #5471476
polaris10 manual
radv_polaris10_vkcts