[Offload] Enable mlir and flang in bot build (llvm#124915)

This enables more projects in the CMake cache to add them to the
buildbot coverage in the AMDGPU buildbots.

Author: jplehr

offload/cmake/caches/AMDGPUBot.cmake

@@ -9,7 +9,7 @@ set(BUILD_SHARED_LIBS ON CACHE BOOL "")
 set(CMAKE_C_COMPILER_LAUNCHER ccache CACHE STRING "")
 set(CMAKE_CXX_COMPILER_LAUNCHER ccache CACHE STRING "")
 
-set(LLVM_ENABLE_PROJECTS "clang;lld" CACHE STRING "")
+set(LLVM_ENABLE_PROJECTS "clang;lld;mlir;flang" CACHE STRING "")
 set(LLVM_ENABLE_RUNTIMES "compiler-rt;openmp;offload" CACHE STRING "")
 
 set(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR ON CACHE BOOL "")