intel/compiler: Lower ffma on Gen4 and Gen5

flrp32 is also a 3-source instruction, but there is another pending
series that handles that for Gen4 and Gen5.

v2: Rebase on "intel/compiler: Don't have sepearate, per-Gen
nir_options"

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Matt Turner <mattst88@gmail.com>
14 jobs for !701 with review/lower-ffma-on-Gen4-and-Gen5 in 10 minutes and 41 seconds (queued for 3 seconds)
latest detached
Status Job ID Name Coverage
  Containers Build
passed debian #258504

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  Build+Test
passed meson-clang #258506

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passed meson-gallium-clover-llvm #258512

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passed meson-gallium-clover-llvm39 #258513

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passed meson-gallium-drivers-other #258511

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passed meson-gallium-radeonsi #258510

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passed meson-gallium-st-other #258514

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passed meson-gallium-swr #258505

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passed meson-glvnd #258509

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passed meson-loader-classic-dri #258508

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passed meson-vulkan #258507

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passed scons-llvm #258516

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passed scons-nollvm #258515

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passed scons-swr #258517

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