[clang] [Driver][SYCL] Add tests for -Xarch_<arch> option forwarding to SYCL JIT compilation. (PR #178025)

[Alexey Bader via cfe-commits]

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+// Test passing of -Xarch_<arch> <option> to SYCL offload compilations.
+
+// Verify that -Xarch_spirv64 forwards options to the SYCL device compilation
+// and clang-linker-wrapper call.
+// RUN: %clang -fsycl -Xarch_spirv64 -O3 -### %s 2>&1 \
+// RUN: | FileCheck -check-prefixes=SYCL-DEVICE-O3,CLW-O3 %s
+// SYCL-DEVICE-O3: "-triple" "spirv64-unknown-unknown" "-O3"{{.*}} "-fsycl-is-device"
+// CLW-O3: {{"[^"]*clang-linker-wrapper[^"]*".* "--device-compiler=spirv64-unknown-unknown=-O3"}}
+
+// Verify that `-Xarch_spirv64` forwards libraries to the device linker.
+// RUN: %clang -fsycl -Xarch_spirv64 -Wl,-lfoo -### %s 2>&1 \
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bader wrote:

```suggestion
// RUN: %clang -fsycl -fsycl-targets=spirv64 -Xarch_spirv64 -Wl,-lfoo -### %s 2>&1 \
```

https://github.com/llvm/llvm-project/pull/178025