[HIP] Make the new driver bundle outputs for device-only

Summary:
The current behavior of HIP is that when --offload-device-only is set it
still bundles the outputs into a fat binary. Even though this is
different from how all the other targets handle this, it seems to be
dependned on by some tooling so just make it backwards compatible for
the `-fno-gpu-rdc` case.

Author: jhuber6

clang/lib/Driver/Driver.cpp

@@ -4638,7 +4638,10 @@ Action *Driver::BuildOffloadingActions(Compilation &C,
     }
   }
 
-  if (offloadDeviceOnly())
+  // All kinds exit now in device-only mode except for non-RDC mode HIP.
+  if (offloadDeviceOnly() &&
+      (!C.isOffloadingHostKind(Action::OFK_HIP) ||
+       Args.hasFlag(options::OPT_fgpu_rdc, options::OPT_fno_gpu_rdc, false)))
     return C.MakeAction<OffloadAction>(DDeps, types::TY_Nothing);
 
   if (OffloadActions.empty())
@@ -4671,6 +4674,10 @@ Action *Driver::BuildOffloadingActions(Compilation &C,
              nullptr, C.getActiveOffloadKinds());
   }
 
+  // HIP wants '--offload-device-only' to create a fatbinary by default.
+  if (offloadDeviceOnly())
+    return C.MakeAction<OffloadAction>(DDep, types::TY_Nothing);
+
   // If we are unable to embed a single device output into the host, we need to
   // add each device output as a host dependency to ensure they are still built.
   bool SingleDeviceOutput = !llvm::any_of(OffloadActions, [](Action *A) {

clang/test/Driver/hip-binding.hip

@@ -64,10 +64,14 @@
 // MULTI-D-ONLY-NEXT: # "amdgcn-amd-amdhsa" - "clang", inputs: ["[[INPUT]]"], output: "[[GFX90a:.+]]"
 // MULTI-D-ONLY-NEXT: # "amdgcn-amd-amdhsa" - "AMDGCN::Linker", inputs: ["[[GFX90a]]"], output: "[[GFX90a_OUT:.+]]"
 //
-// RUN: not %clang -### --target=x86_64-linux-gnu --offload-new-driver -ccc-print-bindings -nogpulib -nogpuinc \
-// RUN:        --offload-arch=gfx90a --offload-arch=gfx908 --offload-device-only -c -o %t %s 2>&1 \
+// RUN: %clang -### --target=x86_64-linux-gnu --offload-new-driver -ccc-print-bindings -nogpulib -nogpuinc \
+// RUN:        --offload-arch=gfx90a --offload-arch=gfx908 --offload-device-only -c -o a.out %s 2>&1 \
 // RUN: | FileCheck -check-prefix=MULTI-D-ONLY-O %s
-// MULTI-D-ONLY-O: error: cannot specify -o when generating multiple output files
+//      MULTI-D-ONLY-O: "amdgcn-amd-amdhsa" - "clang", inputs: ["[[INPUT:.+]]"], output: "[[GFX908_OBJ:.+]]"
+// MULTI-D-ONLY-O-NEXT: "amdgcn-amd-amdhsa" - "AMDGCN::Linker", inputs: ["[[GFX908_OBJ]]"], output: "[[GFX908:.+]]"
+// MULTI-D-ONLY-O-NEXT: "amdgcn-amd-amdhsa" - "clang", inputs: ["[[INPUT]]"], output: "[[GFX90A_OBJ:.+]]"
+// MULTI-D-ONLY-O-NEXT: "amdgcn-amd-amdhsa" - "AMDGCN::Linker", inputs: ["[[GFX90A_OBJ]]"], output: "[[GFX90A:.+]]"
+// MULTI-D-ONLY-O-NEXT: "amdgcn-amd-amdhsa" - "AMDGCN::Linker", inputs: ["[[GFX908]]", "[[GFX90A]]"], output: "a.out"
 
 //
 // Check to ensure that we can use '-fsyntax-only' for HIP output with the new