i965/fs: Mark last used ip for all regs read in the payload

If a source register in the push constant registers uses more than one
register, then we wouldn't update payload_last_use_ip for subsequent
registers.

Unlike most uniform data pushed into registers, the CS gl_LocalInvocationID
data varies per execution channel. Therefore for SIMD16 mode, we have vec16
data in the payload. In this case we then need to mark 2 registers in
payload_last_use_ip as last used by the instruction. There's a similar
situation for the z and w coordinates of gl_FragCoord for fragment shaders,
where it had only happened to work before because of some bogus interferences
which the next commit removes.

(Connor: added bit about gl_FragCoord to commit message)

Signed-off-by: Jordan Justen <[email protected]>
Reviewed-by: Connor Abbott <[email protected]>

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