i965: Combine brw_emit_prim and gen7_emit_prim.

These functions have almost identical code; the only difference is that
a few of the bits moved around.  Adding a few trivial conditionals
allows the same function to work on all generations, and the resulting
code is still quite readable.

v2: Comment that the workaround flush is only necessary on SNB
    (requested by Paul Berry).

Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Eric Anholt <[email protected]>
Reviewed-by: Paul Berry <[email protected]>

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