Vanilla LLVM does not support calling AMDGPU_KERNEL across different sources/bitcodes.
Without this patch https://github.com/RadeonOpenCompute/ROCm-CompilerSupport/issues/45 occurs.
Reference: https://github.com/llvm/llvm-project/issues/60313
===================================================================
--- comgr.orig/test/source1.cl
+++ comgr/test/source1.cl
@@ -35,7 +35,9 @@
 
 #include "include-a.h"
 
+void kernel source3(__global int *j) { *j = FOO; }
+
 void kernel source1(__global int *j) {
   *j += 2;
-  source2(j);
+  source3(j);
 }