Use non-deprecated TBB headers in pxr/usd/usd/instanceCache.h
#2322
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Description of Change(s)
tbb/mutex.h
is deprecated / removed in newer versions of TBB, buttbb/spin_mutex.h
is not. Usingtbb/spin_mutex.h
when possible reduces the warning count when building with TBB 2020.3 and is a small step in makingpxr/usd/usd
compatible with oneAPI.Fixes Issue(s)
This PR is related to the issues above, but does not fully address.