[SYCL][Doc] Fixing incorrect merge of community Readme.md with our version (#5636)

Author: Pavel Chupin

README.md

@@ -28,86 +28,3 @@ See [LICENSE.txt](sycl/LICENSE.TXT) for details.
 See [CONTRIBUTING.md](CONTRIBUTING.md) for details.
 
 *\*Other names and brands may be claimed as the property of others.*
-
-This is an example work-flow and configuration to get and build the LLVM source:
-
-1. Checkout LLVM (including related sub-projects like Clang):
-
-     * ``git clone https://github.com/llvm/llvm-project.git``
-
-     * Or, on windows, ``git clone --config core.autocrlf=false
-    https://github.com/llvm/llvm-project.git``
-
-2. Configure and build LLVM and Clang:
-
-     * ``cd llvm-project``
-
-     * ``cmake -S llvm -B build -G <generator> [options]``
-
-        Some common build system generators are:
-
-        * ``Ninja`` --- for generating [Ninja](https://ninja-build.org)
-          build files. Most llvm developers use Ninja.
-        * ``Unix Makefiles`` --- for generating make-compatible parallel makefiles.
-        * ``Visual Studio`` --- for generating Visual Studio projects and
-          solutions.
-        * ``Xcode`` --- for generating Xcode projects.
-
-        Some common options:
-
-        * ``-DLLVM_ENABLE_PROJECTS='...'`` and ``-DLLVM_ENABLE_RUNTIMES='...'`` ---
-          semicolon-separated list of the LLVM sub-projects and runtimes you'd like to
-          additionally build. ``LLVM_ENABLE_PROJECTS`` can include any of: clang,
-          clang-tools-extra, cross-project-tests, flang, libc, libclc, lld, lldb,
-          mlir, openmp, polly, or pstl. ``LLVM_ENABLE_RUNTIMES`` can include any of
-          libcxx, libcxxabi, libunwind, compiler-rt, libc or openmp. Some runtime
-          projects can be specified either in ``LLVM_ENABLE_PROJECTS`` or in
-          ``LLVM_ENABLE_RUNTIMES``.
-
-          For example, to build LLVM, Clang, libcxx, and libcxxabi, use
-          ``-DLLVM_ENABLE_PROJECTS="clang" -DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi"``.
-
-        * ``-DCMAKE_INSTALL_PREFIX=directory`` --- Specify for *directory* the full
-          path name of where you want the LLVM tools and libraries to be installed
-          (default ``/usr/local``). Be careful if you install runtime libraries: if
-          your system uses those provided by LLVM (like libc++ or libc++abi), you
-          must not overwrite your system's copy of those libraries, since that
-          could render your system unusable. In general, using something like
-          ``/usr`` is not advised, but ``/usr/local`` is fine.
-
-        * ``-DCMAKE_BUILD_TYPE=type`` --- Valid options for *type* are Debug,
-          Release, RelWithDebInfo, and MinSizeRel. Default is Debug.
-
-        * ``-DLLVM_ENABLE_ASSERTIONS=On`` --- Compile with assertion checks enabled
-          (default is Yes for Debug builds, No for all other build types).
-
-      * ``cmake --build build [-- [options] <target>]`` or your build system specified above
-        directly.
-
-        * The default target (i.e. ``ninja`` or ``make``) will build all of LLVM.
-
-        * The ``check-all`` target (i.e. ``ninja check-all``) will run the
-          regression tests to ensure everything is in working order.
-
-        * CMake will generate targets for each tool and library, and most
-          LLVM sub-projects generate their own ``check-<project>`` target.
-
-        * Running a serial build will be **slow**.  To improve speed, try running a
-          parallel build.  That's done by default in Ninja; for ``make``, use the option
-          ``-j NNN``, where ``NNN`` is the number of parallel jobs, e.g. the number of
-          CPUs you have.
-
-      * For more information see [CMake](https://llvm.org/docs/CMake.html)
-
-Consult the
-[Getting Started with LLVM](https://llvm.org/docs/GettingStarted.html#getting-started-with-llvm)
-page for detailed information on configuring and compiling LLVM. You can visit
-[Directory Layout](https://llvm.org/docs/GettingStarted.html#directory-layout)
-to learn about the layout of the source code tree.
-
-## Getting in touch
-
-Join [LLVM Discourse forums](https://discourse.llvm.org/), [discord chat](https://discord.gg/xS7Z362) or #llvm IRC channel on [OFTC](https://oftc.net/).
-
-The LLVM project has adopted a [code of conduct](https://llvm.org/docs/CodeOfConduct.html) for
-participants to all modes of communication within the project.