[llvm] [Offload] Add framework for math conformance tests (PR #149242)

[Joseph Huber via llvm-commits]

================
@@ -96,27 +96,56 @@ function(add_offload_unittest test_dirname)
 endfunction()
 
 function(add_conformance_test test_name)
-  set(target_name "${test_name}.conformance")
-
-  list(TRANSFORM ARGN PREPEND "${CMAKE_CURRENT_SOURCE_DIR}/" OUTPUT_VARIABLE files)
+  set(options "")
+  set(oneValueArgs "")
+  set(multiValueArgs "SOURCES;PROVIDERS")
+  cmake_parse_arguments(ARG "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
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jhuber6 wrote:

```suggestion
  cmake_parse_arguments(CONFORMANCE_TEST "" "" "SOURCES;PROVIDERS" ${ARGN})
```

https://github.com/llvm/llvm-project/pull/149242