[clang] [Clang][SYCL] Introduce clang-sycl-linker to link SYCL offloading device code (Part 1 of many) (PR #112245)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `flang-aarch64-libcxx` running on `linaro-flang-aarch64-libcxx` while building `clang` at step 5 "build-unified-tree".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/89/builds/9528

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 5 (build-unified-tree) failure: build (failure)
...
98.786 [213/17/7020] Creating library symlink lib/libFortranEvaluate.so
98.987 [212/17/7021] Linking CXX shared library lib/libFIRTestAnalysis.so.20.0git
98.995 [211/17/7022] Creating library symlink lib/libFIRTestAnalysis.so
99.169 [211/16/7023] Building CXX object tools/clang/tools/clang-check/CMakeFiles/clang-check.dir/ClangCheck.cpp.o
99.301 [211/15/7024] Linking CXX shared library lib/libHLFIRTransforms.so.20.0git
99.309 [210/15/7025] Creating library symlink lib/libHLFIRTransforms.so
99.814 [208/16/7026] Linking CXX shared library lib/libflangPasses.so.20.0git
99.823 [207/16/7027] Creating library symlink lib/libflangPasses.so
100.028 [206/16/7028] Building CXX object tools/clang/tools/clang-sycl-linker/CMakeFiles/clang-sycl-linker.dir/ClangSYCLLinker.cpp.o
100.109 [205/16/7029] Linking CXX executable bin/clang-sycl-linker
FAILED: bin/clang-sycl-linker 
: && /usr/local/bin/c++ -stdlib=libc++ -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -fno-common -Woverloaded-virtual -Wno-nested-anon-types -O3 -DNDEBUG -stdlib=libc++     -Wl,-rpath-link,/home/tcwg-buildbot/worker/flang-aarch64-libcxx/build/./lib  -Wl,--gc-sections tools/clang/tools/clang-sycl-linker/CMakeFiles/clang-sycl-linker.dir/ClangSYCLLinker.cpp.o -o bin/clang-sycl-linker  -Wl,-rpath,"\$ORIGIN/../lib:/home/tcwg-buildbot/worker/flang-aarch64-libcxx/build/lib:"  lib/libLLVMAArch64CodeGen.so.20.0git  lib/libLLVMAArch64AsmParser.so.20.0git  lib/libLLVMAArch64Disassembler.so.20.0git  lib/libLLVMOption.so.20.0git  lib/libclangBasic.so.20.0git  lib/libLLVMAArch64Desc.so.20.0git  lib/libLLVMAArch64Info.so.20.0git  lib/libLLVMAArch64Utils.so.20.0git  -Wl,-rpath-link,/home/tcwg-buildbot/worker/flang-aarch64-libcxx/build/lib && :
/usr/bin/ld: tools/clang/tools/clang-sycl-linker/CMakeFiles/clang-sycl-linker.dir/ClangSYCLLinker.cpp.o: undefined reference to symbol '_ZN4llvm6TripleC1ERKNS_5TwineE'
/usr/bin/ld: /home/tcwg-buildbot/worker/flang-aarch64-libcxx/build/./lib/libLLVMTargetParser.so.20.0git: error adding symbols: DSO missing from command line
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
100.125 [205/15/7030] Building CXX object tools/clang/lib/Tooling/CMakeFiles/obj.clangTooling.dir/Tooling.cpp.o
100.231 [205/14/7031] Linking CXX executable bin/fir-opt
100.252 [205/13/7032] Building CXX object tools/clang/lib/Tooling/DependencyScanning/CMakeFiles/obj.clangDependencyScanning.dir/DependencyScanningWorker.cpp.o
100.343 [205/12/7033] Building CXX object tools/clang/lib/Interpreter/CMakeFiles/obj.clangInterpreter.dir/InterpreterUtils.cpp.o
100.656 [205/11/7034] Linking CXX executable bin/tco
102.148 [205/10/7035] Building CXX object tools/clang/lib/Interpreter/CMakeFiles/obj.clangInterpreter.dir/InterpreterValuePrinter.cpp.o
103.320 [205/9/7036] Building CXX object tools/clang/tools/clang-installapi/CMakeFiles/clang-installapi.dir/ClangInstallAPI.cpp.o
103.328 [205/8/7037] Linking CXX shared library lib/libFortranSemantics.so.20.0git
105.292 [205/7/7038] Building CXX object tools/clang/tools/driver/CMakeFiles/clang.dir/cc1_main.cpp.o
107.840 [205/6/7039] Building CXX object tools/clang/lib/Interpreter/CMakeFiles/obj.clangInterpreter.dir/Interpreter.cpp.o
109.174 [205/5/7040] Building CXX object tools/clang/tools/clang-scan-deps/CMakeFiles/clang-scan-deps.dir/ClangScanDeps.cpp.o
137.751 [205/4/7041] Building CXX object tools/clang/lib/Frontend/CMakeFiles/obj.clangFrontend.dir/CompilerInvocation.cpp.o
138.943 [205/3/7042] Building CXX object tools/flang/tools/flang-driver/CMakeFiles/flang.dir/driver.cpp.o
150.946 [205/2/7043] Building CXX object tools/flang/lib/Frontend/CMakeFiles/flangFrontend.dir/CompilerInvocation.cpp.o
153.118 [205/1/7044] Building CXX object tools/flang/lib/FrontendTool/CMakeFiles/flangFrontendTool.dir/ExecuteCompilerInvocation.cpp.o
ninja: build stopped: subcommand failed.

```

</details>

https://github.com/llvm/llvm-project/pull/112245