shader: Emit the right GLSL function when dealing with TGSI_MEMBAR_ATOMIC_BUFFER
The GLSL spec does not mention a memoryBarrierAtomic function, and the GLSL to TGSI compiler indicates that a TGSI_MEMBAR_ATOMIC_BUFFER is created from GLSL's memoryBarrierAtomicCounter.
This fixes: KHR-GL43.compute_shader.shared-struct
Signed-off-by: Rohan Garg rohan.garg@collabora.com