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i965/fs: Fix segfault when using INTEL_DEBUG=perf with non-GLSL.
Now that ARB programs and fixed function are routed through the new
backend, shader might be NULL. Don't do INTEL_DEBUG=perf support in
that case, since it relies on shader->compiled_once.
Since INTEL_DEBUG=perf wasn't previously supported, this maintains the
status quo. It might be nice to support it someday, however.
This could be moved to brw_shader_program instead of brw_shader, but
it appears even prog can be NULL in that case.
Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>