Add test for WaveGetLaneIndex (#235)

Test WaveGetLaneIndex; no control flow usage.
Closes #158

Author: spall

test/Feature/WaveOps/WaveGetLaneIndex.test

@@ -0,0 +1,46 @@
+#--- source.hlsl
+RWStructuredBuffer<uint> Out : register(u0);
+
+[numthreads(4, 1, 1)]
+void main(uint3 threadID : SV_DispatchThreadID) {
+  Out[threadID.x] = WaveGetLaneIndex();
+}
+
+//--- pipeline.yaml
+
+---
+Shaders:
+  - Stage: Compute
+    Entry: main
+    DispatchSize: [2, 1, 1]
+Buffers:
+  - Name: Out
+    Format: UInt32
+    Stride: 4
+    ZeroInitSize: 32
+  - Name: ExpectedOut
+    Format: UInt32
+    Stride: 4
+    Data: [0, 1, 2, 3, 0, 1, 2, 3]
+Results:
+  - Result: Test
+    Rule: BufferExact
+    Actual: Out
+    Expected: ExpectedOut
+DescriptorSets:
+  - Resources:
+    - Name: Out
+      Kind: RWStructuredBuffer
+      DirectXBinding:
+        Register: 0
+        Space: 0
+      VulkanBinding:
+        Binding: 0
+...
+#--- end
+
+# https://github.com/llvm/llvm-project/issues/145953
+# XFAIL: Clang-Vulkan
+# RUN: split-file %s %t
+# RUN: %dxc_target -T cs_6_5 -Fo %t.o %t/source.hlsl
+# RUN: %offloader %t/pipeline.yaml %t.o