i965/vec4: Lower 64-bit MAD

The previous patch made sure that we do not generate MAD instructions
for any NIR's 64-bit ffma, but there is nothing preventing i965 from
producing MAD instructions as a result of lowerings or optimization
passes. This patch makes sure that any 64-bit MAD produced inside the
driver after translating from NIR is also converted to MUL+ADD before
we generate code.

v2:
  - Use a copy constructor to copy all relevant instruction fields from
    the original mad into the add and mul instructions

v3:
  - Rename the lowering and fix commit log (Matt)

Signed-off-by: Samuel Iglesias Gonsálvez <[email protected]>
Reviewed-by: Matt Turner <[email protected]>

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