i965: Add opcode names for set_omask and set_sample_id.

Reviewed-by: Chris Forbes <chrisf@ijw.co.nz>
i965: Add missing opcode names.

Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
i965: Remove default from brw_instruction_name switch to catch missing names.

The case-range extension is available in clang and gcc at least back to
3.4.0.

Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
loader: Add missing EXPAT_CFLAGS to libloader.la CPPFLAGS

Reviewed-by: Matt Turner <mattst88@gmail.com>