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glsl: Make opt_constant_variable() bail in useless cases.
The pass ultimately skips over any entries with assignment_count != 1,
so there's no need to do further work once we've determined that there
are multiple assignments.
The constant value could be a large array (i.e. uvec4[327]), at which
point skipping the constant_expression_value() call (and the clone()
call within) can save us piles of memory.
No change in shader-db.
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
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