[OpenMP] Remove use of removed '-f[no-]openmp-new-driver' flag

The changes in D130020 removed all support for the old method of
compiling OpenMP offloading programs. This means that
`-fopenmp-new-driver` has no effect and `-fno-openmp-new-driver` does
not work. This patch removes the use and documentation of this flag.
Note that the `--offload-new-driver` flag still exists for using the new
driver optionally with CUDA and HIP.

Reviewed By: tra

Differential Revision: https://reviews.llvm.org/D133367

Author: jhuber6

clang/docs/ClangCommandLineReference.rst

@@ -2181,10 +2181,6 @@ Enable all Clang extensions for OpenMP directives and clauses
 
 Set rpath on OpenMP executables
 
-.. option:: -fopenmp-new-driver
-
-Use the new driver for OpenMP offloading.
-
 .. option:: -fopenmp-offload-mandatory
 
 Do not create a host fallback if offloading to the device fails.

clang/lib/Driver/Driver.cpp

@@ -3902,9 +3902,7 @@ void Driver::BuildActions(Compilation &C, DerivedArgList &Args,
   OffloadingActionBuilder OffloadBuilder(C, Args, Inputs);
 
   bool UseNewOffloadingDriver =
-      (C.isOffloadingHostKind(Action::OFK_OpenMP) &&
-       Args.hasFlag(options::OPT_fopenmp_new_driver,
-                    options::OPT_no_offload_new_driver, true)) ||
+      C.isOffloadingHostKind(Action::OFK_OpenMP) ||
       Args.hasFlag(options::OPT_offload_new_driver,
                    options::OPT_no_offload_new_driver, false);
 

clang/lib/Driver/ToolChains/Clang.cpp

@@ -4459,9 +4459,7 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
   bool IsDeviceOffloadAction = !(JA.isDeviceOffloading(Action::OFK_None) ||
                                  JA.isDeviceOffloading(Action::OFK_Host));
   bool IsHostOffloadingAction =
-      (JA.isHostOffloading(Action::OFK_OpenMP) &&
-       Args.hasFlag(options::OPT_fopenmp_new_driver,
-                    options::OPT_no_offload_new_driver, true)) ||
+      JA.isHostOffloading(Action::OFK_OpenMP) ||
       (JA.isHostOffloading(C.getActiveOffloadKinds()) &&
        Args.hasFlag(options::OPT_offload_new_driver,
                     options::OPT_no_offload_new_driver, false));
@@ -4762,9 +4760,7 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
 
     if (IsUsingLTO) {
       // Only AMDGPU supports device-side LTO.
-      if (IsDeviceOffloadAction &&
-          !Args.hasFlag(options::OPT_fopenmp_new_driver,
-                        options::OPT_no_offload_new_driver, true) &&
+      if (IsDeviceOffloadAction && !JA.isHostOffloading(Action::OFK_OpenMP) &&
           !Args.hasFlag(options::OPT_offload_new_driver,
                         options::OPT_no_offload_new_driver, false) &&
           !Triple.isAMDGPU()) {

clang/test/Driver/amdgpu-openmp-toolchain.c

@@ -49,5 +49,5 @@
 // RUN:   %clang -### --target=x86_64-unknown-linux-gnu -emit-llvm -S -fopenmp -fopenmp-targets=amdgcn-amd-amdhsa -Xopenmp-target=amdgcn-amd-amdhsa -march=gfx803 -nogpulib %s 2>&1 | FileCheck %s --check-prefix=CHECK-EMIT-LLVM-IR
 // CHECK-EMIT-LLVM-IR: "-cc1" "-triple" "amdgcn-amd-amdhsa"{{.*}}"-emit-llvm"
 
-// RUN: %clang -### -target x86_64-pc-linux-gnu -fopenmp -fopenmp-targets=amdgcn-amd-amdhsa -Xopenmp-target=amdgcn-amd-amdhsa -march=gfx803 -lm --rocm-device-lib-path=%S/Inputs/rocm/amdgcn/bitcode -fopenmp-new-driver %s 2>&1 | FileCheck %s --check-prefix=CHECK-LIB-DEVICE-NEW
+// RUN: %clang -### -target x86_64-pc-linux-gnu -fopenmp -fopenmp-targets=amdgcn-amd-amdhsa -Xopenmp-target=amdgcn-amd-amdhsa -march=gfx803 -lm --rocm-device-lib-path=%S/Inputs/rocm/amdgcn/bitcode %s 2>&1 | FileCheck %s --check-prefix=CHECK-LIB-DEVICE-NEW
 // CHECK-LIB-DEVICE-NEW: {{.*}}clang-linker-wrapper{{.*}}--bitcode-library=openmp-amdgcn-amd-amdhsa-gfx803={{.*}}ocml.bc"{{.*}}ockl.bc"{{.*}}oclc_daz_opt_on.bc"{{.*}}oclc_unsafe_math_off.bc"{{.*}}oclc_finite_only_off.bc"{{.*}}oclc_correctly_rounded_sqrt_on.bc"{{.*}}oclc_wavefrontsize64_on.bc"{{.*}}oclc_isa_version_803.bc"