[llvm-bugs] Compiler-rt build fails on OS X EI Capitan beta 6.

[vivek pandya via llvm-bugs]

 I am trying to build LLVM from source , but I am getting following error
while building compiler-rt :
Undefined symbols for architecture x86_64h:
"_OSSpinLockLock", referenced from:
__sanitizer::BlockingMutex::Lock() in sanitizer_mac.o

Is this a bug or it is due to beta version of my OS ?
Please some one help me to fix this. I am stuck due to this for last 4 days.

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