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this fix applies to the lower_sub_return 'branch' of the lower_jumps pass
Fixes piglit tests glsl-functions-5 and glsl-functions-6.
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This is essentially Luca's commit message, but placed at the top of the
file.
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The new lower_discard and opt_discard_simplification passes should
handle all the necessary transformations, so lower_jumps doesn't need to
support it.
Also, lower_jumps incorrectly handled conditional discards - it would
unconditionally truncate all code after the discard. Rather than fixing
the bug, simply remove the code.
NOTE: This is a candidate for the 7.9 branch.
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This helps distinguish between lowering passes, optimization passes, and
other compiler code.
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