vc4: Do instruction scheduling on the QIR to hide texture fetch latency.

This is a rewrite of vc4_opt_qpu_schedule.c to operate on QIR.  Texture
fetch can probably take as much as the rest of the cycles of the program,
so it's important to hide our other cycles during it (which is hard to do
after register allocation).  Also, we can queue up multiple texture
requests before collecting the resulting samples, so that we keep the
texture unit busy more of the time.

High-settings openarena performance +2.35849% +/- 0.221154% (n=7).  Also
about 2-3% on the multiarb demo.  8 piglit tests
(ext_framebuffer_multisample accuracy depthstencil) go from failing in
rendering to failing in register allocation, but hopefully I can fix that
up with some better register pressure handling here.

total instructions in shared programs: 87723 -> 88448 (0.83%)
instructions in affected programs:     78411 -> 79136 (0.92%)
total estimated cycles in shared programs: 276583 -> 246306 (-10.95%)
estimated cycles in affected programs:     265691 -> 235414 (-11.40%)

1 files changed, 1 insertions, 0 deletions

diff --git a/src/gallium/drivers/vc4/vc4_qir.h b/src/gallium/drivers/vc4/vc4_qir.h
index c34dce3aec8..b0fbb4c1db2 100644
--- a/src/gallium/drivers/vc4/vc4_qir.h
+++ b/src/gallium/drivers/vc4/vc4_qir.h
@@ -459,6 +459,7 @@ void qir_remove_instruction(struct vc4_compile *c, struct qinst *qinst);
 struct qreg qir_uniform(struct vc4_compile *c,
                         enum quniform_contents contents,
                         uint32_t data);
+void qir_schedule_instructions(struct vc4_compile *c);
 void qir_reorder_uniforms(struct vc4_compile *c);
 
 void qir_emit(struct vc4_compile *c, struct qinst *inst);