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meson: prevent memory sanitizer builds with asm

For example in dav1d_cdef_brow_{8,10}bpc memory sanitizer can not track
that variance is initilized by dsp->cdef.dir() it is implemented by in
asm.

--- a/meson.build

+++ b/meson.build

@@ -66,6 +66,9 @@

      host_machine.cpu_family().startswith('arm'))

 cdata.set10('HAVE_ASM', is_asm_enabled)

+if is_asm_enabled and get_option('b_sanitize') == 'memory'

+    error('asm causes false positive with memory sanitizer. Use \'-Dbuild_asm=false\'.')

+endif

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