Revert "[Support] Add file lock/unlock functions"
This reverts commit f51bc4fb. It broke the Solaris buildbots (Builder clang-solaris11-sparcv9 Build #5494 <http://lab.llvm.org:8014/builders/clang-solaris11-sparcv9/builds/54).
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This reverts commit f51bc4fb. It broke the Solaris buildbots (Builder clang-solaris11-sparcv9 Build #5494 <http://lab.llvm.org:8014/builders/clang-solaris11-sparcv9/builds/54).