[flang] [llvm] [flang-rt] Add experimental support for GPU build (PR #131826)

[Michael Kruse via llvm-commits]

================
@@ -88,6 +87,54 @@ set(host_sources
   unit-map.cpp
 )
 
+# Sources that can be compiled directly for the GPU.
+set(gpu_sources
----------------
Meinersbur wrote:

Can we avoid duplicating the list of sources? What makes theses gpu-compatible?

https://github.com/llvm/llvm-project/pull/131826