Update uniform control flow language for ray tracing shader call and invocation repack instructions (#376)

* Add invocation repack instruction definition to SPIR-V and reference from uniform control flow language

* Add new reorder instructions to the repack list

Author: ewerness-nv

extensions/EXT/SPV_EXT_shader_invocation_reorder.asciidoc

@@ -165,6 +165,14 @@ Add <<OpTraceRayWithHitObjectEXT,*OpTraceRayWithHitObjectEXT*>>,
 <<OpHitObjectTraceReorderExecuteEXT,*OpHitObjectTraceReorderExecuteEXT>> to the list
 of shader call instructions.
 
+Add <<OpReorderThreadWithHintEXT,*OpReorderThreadWithHintEXT*>>,
+<<OpReorderThreadWithHitObjectEXT,*OpReorderThreadWithHitObjectEXT*>>,
+<<OpHitObjectTraceRayEXT,*OpHitObjectTraceRayEXT*>>,
+<<OpHitObjectReorderExecuteShaderEXT,*OpHitObjectReorderExecuteShaderEXT*>>,
+<<OpHitObjectTraceReorderExecuteEXT,*OpHitObjectTraceReorderExecuteEXT*>>,
+<<OpHitObjectTraceRayMotionEXT,*OpHitObjectTraceRayMotionEXT*>>,
+<<OpHitObjectTraceMotionReorderExecuteEXT,*OpHitObjectTraceMotionReorderExecuteEXT*>> to the list of invocation repack instructions.
+
 (Add the following terminology to section 2.2.2, Types) ::
 +
 --

extensions/KHR/SPV_KHR_ray_tracing.asciidoc

@@ -158,11 +158,21 @@ other shaders. The <<OpTraceRayKHR,*OpTraceRayKHR*>>,
 <<OpReportIntersectionKHR,*OpReportIntersectionKHR*>> instructions are
 shader call instructions.
 
+_Invocation Repack Instruction_: An instruction which may change the
+set of invocations that are executing. The <<OpTraceRayKHR,*OpTraceRayKHR*>>,
+<<OpExecuteCallableKHR,*OpExecuteCallableKHR*>>, and
+<<OpReportIntersectionKHR,*OpReportIntersectionKHR*>> instructions are
+invocation repack instructions.
 
 (Modify Section 2.2.2, Types ) ::
 +
 add *OpTypeAccelerationStructureKHR* to list of opaque types
 
+(Modify Section 2.2.5, Control Flow) ::
++
+Modify the Uniform Control Flow definition to include shader call instructions
+and invocation repack instructions as instructions which may cause divergence.
+
 (Modify Section 2.2.5, Control Flow) ::
 +
 Add *OpIgnoreIntersectionKHR* and *OpTerminateRayKHR* to the list of _Termination Instructions_.