microsoft/compiler: Fix clang fallthrough warnings

Reviewed-by: Adam Jackson <ajax@redhat.com>
Part-of: <!8248>
38 jobs for !8248 with d3d12-gcc-werror in 10 minutes and 38 seconds (queued for 2 seconds)
detached
Status Job ID Name Coverage
  Sanity
passed #6426225
sanity

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  Container
passed #6426231
aarch64
arm_build

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arm_test-base

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windows shell 1809 mesa
windows_build_vs2019

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x86_build-base

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x86_test-base

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  Container 2
passed #6426251
android_build

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arm64_test

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armhf_test

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i386_build

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kernel+rootfs_amd64

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aarch64
kernel+rootfs_arm64

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passed #6426243
aarch64
kernel+rootfs_armhf

00:00:20

passed #6426248
ppc64el_build

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s390x_build

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x86_build

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x86_test-gl

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x86_test-vk

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  Meson X86 64
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meson-clang

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meson-clover

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meson-clover-testing

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meson-gallium

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meson-release

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meson-testing

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meson-testing-asan

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meson-vulkan

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failed #6426261
meson-testing

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  Build Misc
passed #6426275
meson-android

00:00:37

passed #6426279
aarch64
meson-arm64

00:01:28

passed #6426281
aarch64
meson-arm64-build-test

00:01:25

passed #6426277
aarch64
meson-armhf

00:01:28

passed #6426287
meson-i386

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passed #6426293
meson-mingw32-x86_64

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passed #6426291
kvm
meson-ppc64el

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passed #6426289
kvm
meson-s390x

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passed #6426283
windows docker 1809 mesa
meson-windows-vs2019

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passed #6426285
scons-win64

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  Layered Backends
passed #6426294
windows docker 1809 mesa
test-d3d12-windows

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