virgl: Apply integer op fix only for ALU ops and clear modifiers

virgl: Apply integer op fix only for ALU ops and clear modifiers

For texture fetches and buffer load the fix is not needed,
and the override creates faulty TGSI.

In addition remove all modifiers from the src in the additional mov
instruction.

Fixes: d1c7a7b1317c518e160cc6d37245de22b2bfa60d
  virgl: Add an extra mov for int outputs from constant and immediate inputs

v2: Move workaround after the use of
    virgl_tgsi_rewrite_src_for_input_temp (Emma)

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15896>