i965/vec4/gs: restore the uniform values which was overwritten by failed vec4_gs_visi...

i965/vec4/gs: restore the uniform values which was overwritten by failed vec4_gs_visitor execution

We are going to add a packing feature to reduce the usage of the push
constant buffer. One of the consequences is that 'nr_params' would be
modified by vec4_visitor's run call, so we need to restore it if one of
them failed before executing the fallback ones. Same thing happens to the
uniforms values that would be reordered afterwards.

Fixes GL45-CTS.arrays_of_arrays_gl.InteractionFunctionCalls2 when
the dvec4 alignment and packing patch is applied.

Signed-off-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
Cc: "17.1" <mesa-stable@lists.freedesktop.org>
Acked-by: Francisco Jerez <currojerez@riseup.net>