nir: define a max loop unroll limit which overrides force unroll

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=111120
Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
17 jobs for !1716 with loop-force-unroll-limit in 36 minutes and 35 seconds (queued for 25 minutes and 59 seconds)
latest detached
Status Job ID Name Coverage
  Containers Build
passed #517857
debian

00:00:20

 
  Build+Test
passed #517866
meson-arm64

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passed #517865
meson-armhf

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passed #517859
meson-clang

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passed #517863
meson-clover

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passed #517867
meson-i386

00:04:31

passed #517862
meson-main

00:14:26

passed #517858
meson-swr-glvnd

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passed #517864
meson-vulkan

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passed #517869
scons-llvm

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passed #517868
scons-nollvm

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passed #517860
scons-swr

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passed #517861
scons-win64

00:09:02

 
  Test
passed #517870
test-llvmpipe-gles2 1/4

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passed #517871
test-llvmpipe-gles2 2/4

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passed #517872
test-llvmpipe-gles2 3/4

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passed #517873
test-llvmpipe-gles2 4/4

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