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i965: Tidy preprocessor macros for SO_PRIM_STORAGE_NEEDED registers.
Gen7+ supports four transform feedback streams. Using a function-like
macro makes it easy to access them by stream number or loop over them.
"GEN7_" prefixes are more common than "_IVB" suffixes, so use that.
Gen6 only supports a single stream, so the single #define should be
fine. However, SO_NUM_PRIM_STORAGE_NEEDED was a poor name. For one,
the word "NUM" doesn't appear in the actual name of the register.
It's also confusingly generic, as it doesn't exist on Gen7+. Add a
"GEN6_" prefix for clarity.
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Paul Berry <stereotype441@gmail.com>