add the test for SPIR-V QuantizeToF16 operation and mark it as xfail

Author: YixingZhang007

llvm/test/CodeGen/SPIRV/instructions/quantizeto16.ll

@@ -0,0 +1,15 @@
+; RUN: llc -verify-machineinstrs -O0 -mtriple=spirv-unknown-vulkan-compute %s -o - | FileCheck %s
+; RUN: %if spirv-tools %{ llc -O0 -mtriple=spirv-unknown-vulkan-compute %s -o - -filetype=obj | spirv-val %}
+
+; TODO:  Implement support for the SPIR-V QuantizeToF16 operation
+; XFAIL: *
+
+; CHECK-DAG: [[F32:%.*]] = OpTypeFloat 32
+; CHECK: %[[#]] = OpQuantizeToF16 [[F32]] %[[#]]
+define spir_func void @test_wrappers() {
+  entry:
+  %r8 = call spir_func float @__spirv_QuantizeToF16(float 0.000000e+00)
+  ret void
+}
+
+declare dso_local spir_func float @__spirv_QuantizeToF16(float)