intel/fs/vec4: add missing dependency in write-on-write fixed GRFs
If we load constant data using pull constant SENDS, and we later load that register with some other data, we can end up in a situation where we don't track the initial fixed register write and therefore end up using uninitialized registers. This tracks write-on-write of fixed GRFs like we do for normal virtual GRFs. v2: Fix post_alloc_reg case (Jason) Signed-off-by:Lionel Landwerlin <lionel.g.landwerlin@intel.com> Cc: <mesa-stable@lists.freedesktop.org> Reviewed-by:
Francisco Jerez <currojerez@riseup.net> Reviewed-by:
Jason Ekstrand <jason@jlekstrand.net> Part-of: <mesa/mesa!9667> (cherry picked from commit 8b6d2210)
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