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mesa: change MAX_PROGRAM_ADDRESS_REGS to 1, clamp to it in state tracker
We've never properly supported more than one address register. There
isn't even a field in prog_src_register or prog_dst_register to indicate
which address register to use if RelAddr!=0.
In the state tracker, clamp MaxAddressRegs against MAX_PROGRAM_ADDRESS_REGS
since many gallium drivers do support more.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=65226
Reviewed-by: Jose Fonseca <jfonseca@vmware.com>