nvir/gm107: consider FILE_FLAGS dependencies in SchedDataCalculatorGM107

nvir/gm107: consider FILE_FLAGS dependencies in SchedDataCalculatorGM107

currently while insterting barriers, writes and reads to FILE_FLAGS aren't
considered. This can lead to WaR hazards in some situations.

With the previous commit fixes shaders with intstructions like this:
  mad u32 $r2 $r4 $r11 $r2
  mad u32 { $r5 $c0 } $r4 $r10 $r6
  mad (SUBOP:1) u32 $r3 $r4 $r10 $r2 $c0

Affects OpenCL CTS tests on Maxwell+:
basic/test_basic intmath_long
basic/test_basic intmath_long2
basic/test_basic intmath_long4

v2: only put barriers on instructions which actually read flags

Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Signed-off-by: Karol Herbst <kherbst@redhat.com>