[SYCL] Emit textual IR when -S -fsycl-device-only is used (#1314)

Signed-off-by: Joshua Cranmer <joshua.cranmer@intel.com>

Author: jcranmer-intel

clang/lib/Driver/Driver.cpp

@@ -4751,9 +4751,11 @@ Action *Driver::ConstructPhaseAction(
       return C.MakeAction<BackendJobAction>(Input, Output);
     }
     if (Args.hasArg(options::OPT_fsycl_device_only)) {
+      types::ID OutputType =
+          Args.hasArg(options::OPT_S) ? types::TY_LLVM_IR : types::TY_LLVM_BC;
       if (Args.hasFlag(options::OPT_fsycl_use_bitcode,
                        options::OPT_fno_sycl_use_bitcode, true))
-        return C.MakeAction<BackendJobAction>(Input, types::TY_LLVM_BC);
+        return C.MakeAction<BackendJobAction>(Input, OutputType);
       // Use of -fsycl-device-only creates a bitcode file, we need to translate
       // that to a SPIR-V file with -fno-sycl-use-bitcode
       auto *BackendAction =

clang/test/Driver/sycl.c

@@ -23,6 +23,7 @@
 
 // RUN: %clang -### -fsycl-device-only -c %s 2>&1 | FileCheck %s --check-prefix=DEFAULT
 // RUN: %clang -### -fsycl-device-only %s 2>&1 | FileCheck %s --check-prefix=DEFAULT
+// RUN: %clang -### -fsycl-device-only -S %s 2>&1 | FileCheck %s --check-prefix=TEXTUAL
 // RUN: %clang -### -fsycl-device-only -fsycl  %s 2>&1 | FileCheck %s --check-prefix=DEFAULT
 // RUN: %clang -### -fsycl-device-only -fno-sycl-use-bitcode -c %s 2>&1 | FileCheck %s --check-prefix=NO-BITCODE
 // RUN: %clang -### -target spir64-unknown-linux-sycldevice -c -emit-llvm %s 2>&1 | FileCheck %s --check-prefix=TARGET
@@ -39,6 +40,7 @@
 // NO-BITCODE: "{{.*}}llvm-spirv"{{.*}} "-spirv-max-version=1.1"{{.*}} "-spirv-ext=+all"
 // TARGET: "-triple" "spir64-unknown-linux-sycldevice"{{.*}} "-fsycl-is-device"{{.*}} "-emit-llvm-bc"
 // COMBINED: "-triple" "spir64-unknown-{{.*}}-sycldevice"{{.*}} "-fsycl-is-device"{{.*}} "-emit-llvm-bc"
+// TEXTUAL: "-triple" "spir64-unknown-{{.*}}-sycldevice{{.*}}" "-fsycl-is-device"{{.*}} "-emit-llvm"
 
 /// Verify -fsycl-device-only phases
 // RUN: %clang -### -ccc-print-phases -fsycl-device-only %s 2>&1 | FileCheck %s --check-prefix=DEFAULT-PHASES