Wait on fence sync status query.
Wait on fence sync status query.

Bug 24300960

Change-Id: I10a97536bb6559ea7b302b475d0b6936a495b65a
Reviewed-on: https://swiftshader-review.googlesource.com/4210
Reviewed-by: Nicolas Capens <0612353e1fcebbfd4b302d9337447ca0cdfa9122@google.com>
Tested-by: Nicolas Capens <0612353e1fcebbfd4b302d9337447ca0cdfa9122@google.com>

bkaradzic/SwiftShader,bkaradzic/SwiftShader,google/swiftshader,google/swiftshader,bkaradzic/SwiftShader,bkaradzic/SwiftShader,google/swiftshader,bkaradzic/SwiftShader