clover/llvm: handle Fixed vs Scalable vectors explicitly starting with llvm-11

This fixes compilation with llvm-13.

Closes: #4200
Signed-off-by: Karol Herbst <kherbst@redhat.com>
Reviewed-by: Francisco Jerez <currojerez@riseup.net>
Part-of: <!9973>
36 jobs for !9973 with llvm-13 in 9 minutes and 10 seconds (queued for 2 seconds)
latest detached
Status Job ID Name Coverage
  Sanity
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sanity

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  Container
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aarch64
arm_build

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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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android_build

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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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aarch64
kernel+rootfs_arm64-baremetal

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aarch64
kernel+rootfs_armhf

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aarch64
kernel+rootfs_armhf-baremetal

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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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  Build Misc
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arm_test

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meson-android

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aarch64
meson-arm64

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aarch64
meson-arm64-asan

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aarch64
meson-arm64-build-test

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aarch64
meson-armhf

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meson-i386

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meson-mingw32-x86_64

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meson-ppc64el

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kvm
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  Software Renderer
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llvmpipe-piglit-cl

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