DynamoRIO / DynamoRIO/drmemory

dynamically swap between SYS_sem_getvalue and SYS_sysctlbyname

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Component-DrSyscall Migrated OpSys-OSX Priority-Medium
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Description

_From [bruen...@google.com](https://code.google.com/u/109494838902877177630/) on November 19, 2014 21:28:37_

Split from issue #1643 /\* XXX: Yosemite changed 274 from SYS_sem_getvalue to SYS_sysctlbyname
- rather than simply deprecating the number.
- We need to have a dynamic handler that swaps based on the underlying OS ver.
*/

_Original issue: http://code.google.com/p/drmemory/issues/detail?id=1659_

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