Add AMDGPU_kernel calling convention to detected kernels

Author: omarahmed1111

llvm/lib/SYCLLowerIR/ModuleSplitter.cpp

@@ -113,7 +113,8 @@ bool isGenericBuiltin(StringRef FName) {
 }
 
 bool isKernel(const Function &F) {
-  return F.getCallingConv() == CallingConv::SPIR_KERNEL;
+  return F.getCallingConv() == CallingConv::SPIR_KERNEL ||
+    F.getCallingConv() == CallingConv::AMDGPU_KERNEL;
 }
 
 bool isEntryPoint(const Function &F, bool EmitOnlyKernelsAsEntryPoints) {

llvm/test/tools/sycl-post-link/device-code-split/amd-kernel-split.ll

@@ -0,0 +1,17 @@
+; -- Per-kernel split
+; RUN: sycl-post-link -split=kernel -emit-only-kernels-as-entry-points -S < %s -o %tC.table
+; RUN: FileCheck %s -input-file=%tC_0.ll --check-prefixes CHECK-A0
+; RUN: FileCheck %s -input-file=%tC_1.ll --check-prefixes CHECK-A1
+
+define dso_local amdgpu_kernel void @Kernel1() {
+  ret void
+}
+
+define dso_local amdgpu_kernel void @Kernel2() {
+  ret void
+}
+
+; CHECK-A0: define dso_local amdgpu_kernel void @Kernel2()
+; CHECK-A0-NOT: define dso_local amdgpu_kernel void @Kernel1()
+; CHECK-A1-NOT: define dso_local amdgpu_kernel void @Kernel2()
+; CHECK-A1: define dso_local amdgpu_kernel void @Kernel1()