lib/amdgcn/bitcode is not among the default bitcode dirs of clang
Add --rocm-device-lib-path to the clang argument
Excerpt from https://salsa.debian.org/rocm-team/rocm-device-libs/-/blob/d2014eed680ccce5f9bd61ff4fc28a89682575f3/debian/patches/cmake-amdgcn-bitcode.patch
==============================================
--- rocm-device-libs.orig/test/constant_folding/RunConstantFoldTest.cmake
+++ rocm-device-libs/test/constant_folding/RunConstantFoldTest.cmake
@@ -16,6 +16,7 @@
   -target amdgcn-amd-amdhsa -mcpu=${TEST_CPU}
   -Xclang -finclude-default-header
   --rocm-path=${BINARY_DIR}
+  --rocm-device-lib-path=${AMDGCN_BITCODES}
   -mllvm -amdgpu-simplify-libcall=0
   -o ${OUTPUT_FILE} ${INPUT_FILE}
   RESULT_VARIABLE CLANG_RESULT
--- rocm-device-libs.orig/test/constant_folding/CMakeLists.txt
+++ rocm-device-libs/test/constant_folding/CMakeLists.txt
@@ -30,6 +30,7 @@
      -DFILECHECK_BIN=${FILECHECK_BIN}
      -DOUTPUT_FILE=output.${name}.ll
      -DINPUT_FILE=${CMAKE_CURRENT_SOURCE_DIR}/${name}.cl
+     -DAMDGCN_BITCODES=${PROJECT_BINARY_DIR}/lib/amdgcn/bitcode
      -DTEST_CPU=gfx900
      -P ${CMAKE_CURRENT_SOURCE_DIR}/RunConstantFoldTest.cmake)
 endfunction()