[Flang-new][OpenMP] Add offload related flags for AMDGPU

Flang-new needs to add mlink-builtin-bitcode objects
to properly support offload code generation for AMD GPU.

fcuda-is-device flag is not used by Flang currently.
In the future it will be needed for Flang equivalent function:
AMDGPUTargetCodeGenInfo::getGlobalVarAddressSpace.

Author: DominikAdamski

clang/include/clang/Driver/Options.td

@@ -8016,7 +8016,7 @@ def source_date_epoch : Separate<["-"], "source-date-epoch">,
 // CUDA Options
 //===----------------------------------------------------------------------===//
 
-let Visibility = [CC1Option] in {
+let Visibility = [CC1Option, FC1Option] in {
 
 def fcuda_is_device : Flag<["-"], "fcuda-is-device">,
   HelpText<"Generate code for CUDA device">,
@@ -8031,7 +8031,7 @@ def fno_cuda_host_device_constexpr : Flag<["-"], "fno-cuda-host-device-constexpr
   HelpText<"Don't treat unattributed constexpr functions as __host__ __device__.">,
   MarshallingInfoNegativeFlag<LangOpts<"CUDAHostDeviceConstexpr">>;
 
-} // let Visibility = [CC1Option]
+} // let Visibility = [CC1Option, FC1Option]
 
 //===----------------------------------------------------------------------===//
 // OpenMP Options

clang/lib/Driver/ToolChains/Flang.cpp

@@ -333,6 +333,9 @@ void Flang::AddAMDGPUTargetArgs(const ArgList &Args,
     StringRef Val = A->getValue();
     CmdArgs.push_back(Args.MakeArgString("-mcode-object-version=" + Val));
   }
+
+  const ToolChain &TC = getToolChain();
+  TC.addClangTargetOptions(Args, CmdArgs, Action::OffloadKind::OFK_OpenMP);
 }
 
 void Flang::addTargetOptions(const ArgList &Args,

flang/test/Driver/omp-driver-offload.f90

@@ -227,3 +227,11 @@
 ! FORCE-USM-OFFLOAD-SAME: "-fopenmp" "-fopenmp-force-usm"
 ! FORCE-USM-OFFLOAD-NEXT: "{{[^"]*}}flang-new" "-fc1" "-triple" "amdgcn-amd-amdhsa"
 ! FORCE-USM-OFFLOAD-SAME: "-fopenmp" "-fopenmp-force-usm"
+
+! RUN:   %flang -### -v --target=x86_64-unknown-linux-gnu -fopenmp  \
+! RUN:      --offload-arch=gfx900 \
+! RUN:      --rocm-path=%S/Inputs/rocm %s 2>&1 \
+! RUN:   | FileCheck --check-prefix=MLINK-BUILTIN-BITCODE  %s
+! MLINK-BUILTIN-BITCODE:      "{{[^"]*}}flang-new" "-fc1" "-triple" "amdgcn-amd-amdhsa"
+! MLINK-BUILTIN-BITCODE-SAME: "-fcuda-is-device"
+! MLINK-BUILTIN-BITCODE-SAME: "-mlink-builtin-bitcode" {{.*Inputs.*rocm.*amdgcn.*bitcode.*}}oclc_isa_version_900.bc