add overflow test, xfail failing tests

Author: kmpeng

test/Feature/HLSLLib/adduint64.test

@@ -7,13 +7,13 @@ RWStructuredBuffer<uint4> Out : register(u1);
 void main() {
   // vec4
   Out[0] = AddUint64(In[0], In[0]);
-  Out[1] = AddUint64(uint4(1, 0, 1, 256), uint4(1, 0, 1, 256));
 
   // vec2
   uint4 Tmp = {AddUint64(In[1].xy, In[1].xy), AddUint64(In[1].zw, In[1].zw)};
-  Out[2] = Tmp;
+  Out[1] = Tmp;
   uint4 Tmp2 = {AddUint64(In[2].xy, In[2].xy), AddUint64(In[2].zw, In[2].zw)};
-  Out[3] = Tmp2;
+  Out[2] = Tmp2;
+  Out[3].xy = AddUint64(uint2(0xffffffff, 0xffffffff), uint2(1, 0)); // overflow test
 }
 
 //--- pipeline.yaml
@@ -36,8 +36,8 @@ Buffers:
   - Name: ExpectedOut # The result we expect
     Format: UInt32
     Stride: 16
-    Data: [ 2, 0, 2, 512, 2, 0, 2, 512, 20000, 20002, 0, 3, 0xfffffffe, 0xfffffffe, 0xfffffffe, 0xffffffff ]
-    # 2, 0, 2, 512, 2, 0, 2, 512, 20000, 20002, 0, 3, 4294967294, 4294967294, 4294967294, 4294967295
+    Data: [ 2, 0, 2, 512, 20000, 20002, 0, 3, 0xfffffffe, 0xfffffffe, 0xfffffffe, 0xffffffff, 0, 0, 0, 0 ]  # Last two are filler
+    # 2, 0, 2, 512, 20000, 20002, 0, 3, 4294967294, 4294967294, 4294967294, 4294967295, 0, 0, 0, 0
 Results:
   - Result: Test1
     Rule: BufferExact
@@ -64,6 +64,15 @@ DescriptorSets:
 
 # https://github.com/llvm/llvm-project/issues/149345
 # XFAIL: Clang-DirectX
+# XFAIL: Clang-Metal
+
+# https://github.com/llvm/llvm-project/issues/149919
+# XFAIL: Clang-Vulkan
+
+# https://github.com/llvm/offload-test-suite/issues/292
+# XFAIL: DXC-Metal
+
+# UNSUPPORTED: DXC-Vulkan
 
 # RUN: split-file %s %t
 # RUN: %dxc_target -T cs_6_5 -Fo %t.o %t/source.hlsl