Add openmp docs to SphinxDocsBuilder.

[andreil99]

Summary

Since openmp Sphinx docs are buildable, we can expand SphinxDocsBuilder to build and publish that as well.

[jdoerfert]

LGTM, Thanks a lot :)

[gkistanova]

LGTM

zorg/buildbot/builders/SphinxDocsBuilder.py

llvm_docs = OrderedDict([
   # Project              Build target             Local path                            Remote path
   ("llvm",              ("docs-llvm-html",        "docs/html/",                         "llvm")),
   ("clang",             ("docs-clang-html",       "tools/clang/docs/html/",             "cfe")),
   ("clang-tools-extra", ("docs-clang-tools-html", "tools/clang/tools/extra/docs/html/", "clang-tools-extra")),
   ("libcxx",            ("docs-libcxx-html",      "projects/libcxx/docs/html/",         "libcxx")),
   ("libunwind",         ("docs-libunwind-html",   "projects/libunwind/docs/html/",      "libunwind")),
   ("lld",               ("docs-lld-html",         "tools/lld/docs/html/",               "lld")),
   ("lldb",              ("docs-lldb-html",        "tools/lldb/docs/html/",              "lldb")),
+  ("openmp",            ("docs-openmp-html",      "projects/openmp/docs/html/",         "openmp")),
   ("polly",             ("docs-polly-html",       "tools/polly/docs/html/",             "polly")),
 ])
 
 
 def getSphinxDocsBuildFactory(
         llvm_html         = False, # Build LLVM HTML documentation
         llvm_man          = False, # Build LLVM man pages
         clang_html        = False, # Build Clang HTML documentation
if depends_on_projects is None:
             "llvm",
             "clang",
             "clang-tools-extra",
             "libcxx",
             "libcxxabi",
             "libunwind",
             "lld",
             "lldb",
+            "openmp",
             "polly",
         ]
     else:
         # Make a local copy of depends_on_projects, as we are going to modify
         # that.
         _depends_on_projects=depends_on_projects[:]
         # Some projects are interdependent for the purpose of documentation.
         # Enforce the dependencies.