gallivm: drop lower_ffma32 let the backend handle it.

This makes a bunch of CL tests execute a lot faster.
49 jobs for !7058 with llvmpipe-cl-scratch in 25 seconds (queued for 2 seconds)
latest detached
Status Job ID Name Coverage
  Container
manual #5185860
aarch64 manual
arm_build
manual #5185861
manual
arm_test-base
passed #5185862
git_archive

00:00:15

manual #5185857
manual
x86_build-base
manual #5185859
manual
x86_build_old
manual #5185858
manual
x86_test-base
 
  Container 2
created #5185870
android_build
created #5185873
arm64_test
created #5185867
i386_build
created #5185863
kernel+rootfs_amd64
created #5185864
aarch64
kernel+rootfs_arm64
created #5185865
aarch64
kernel+rootfs_armhf
created #5185868
ppc64el_build
created #5185869
s390x_build
created #5185866
x86_build
created #5185871
x86_test-gl
created #5185872
x86_test-vk
 
  Sanity
passed #5185874
check mr

00:00:10

 
  Meson X86 64
created #5185880
meson-clang
created #5185879
meson-classic
created #5185881
meson-clover
created #5185876
meson-clover-testing
created #5185877
meson-gallium
created #5185878
meson-release
created #5185875
meson-testing
created #5185882
meson-vulkan
 
  Scons
created #5185883
allowed to fail
scons-win64
 
  Meson Misc
created #5185884
meson-android
created #5185886
aarch64
meson-arm64
created #5185887
aarch64
meson-arm64-build-test
created #5185885
aarch64
meson-armhf
created #5185888
meson-i386
created #5185891
meson-mingw32-x86_64
created #5185890
kvm
meson-ppc64el
created #5185889
kvm
meson-s390x
 
  Llvmpipe
created #5185896
llvmpipe-gles2
created #5185897
llvmpipe-traces
created #5185892
piglit-cl
created #5185894
piglit-glslparser
created #5185893
piglit-quick_gl
created #5185895
piglit-quick_shader
 
  Virgl
created #5185902
virgl-gl30-on-gl
created #5185903
virgl-gl31-on-gl
created #5185904
virgl-gl32-on-gl
created #5185898
virgl-gles2-on-gl
created #5185900
virgl-gles31-on-gl 1/2
created #5185901
virgl-gles31-on-gl 2/2
created #5185899
virgl-gles3-on-gl
created #5185905
virgl-traces