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Merge commit 62654cab7 from llvm git (by me):

Description

Merge commit 62654cab7 from llvm git (by me):

Restore functionality of --sysroot on FreeBSD after b18cb9c47

After b18cb9c47, clang would sometimes prefer the host C++ includes
(e.g. in /usr/include/c++/v1) before those specified via --sysroot.
While this behavior may be desirable on Linux, it is not so on
FreeBSD, where we make extensive use of --sysroot during the build of
the base system.  In that case, clang must *not* search outside the
sysroot, except for its own internal headers.

Add an override addLibCxxIncludePaths() to restore the old behavior,
which is to simply append /usr/include/c++/v1 to the specified
sysroot.  While here, apply clang-format to the FreeBSD specific
toolchain files.

Fixes PR44923.

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rS357998: bridge: Basic test case
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