[LLVMdev] [PATCH] Slim Reader/Writer Support

[Aaron Ballman]

This patch seems to have gotten lost in the mix over the past month,
so I am reposting.  Apologies if this is incorrect!

This patch includes removes a FIXME for slim reader/writer locks on
Windows Vista and higher, since the functionality is available in the
OS there.  It falls back on the heavyweight critical sections
implementation for Windows XP because the reader/writer locks are
unavailable.

~Aaron
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