[OpenMP] remove an erroneous assert on the location argument

[vadikp-intel]

Summary

The 'loc' argument is optional, and some compilers (e.g. MSVC) do no supply it.

[tianshilei1992]

LG

[vadikp-intel]

closed by commit 7fd6d2babf4dcaa24f24da18cd0a858fa89579e8

openmp/runtime/src/kmp_runtime.cpp

__kmp_determine_reduction_method(
   // can be selected by RTL
   // Finally, it's up to OpenMP RTL to make a decision on which method to select
   // among generated by PAROPT.
 
   PACKED_REDUCTION_METHOD_T retval;
 
   int team_size;
 
-  KMP_DEBUG_ASSERT(loc); // it would be nice to test ( loc != 0 )
   KMP_DEBUG_ASSERT(lck); // it would be nice to test ( lck != 0 )
 
 #define FAST_REDUCTION_ATOMIC_METHOD_GENERATED                                 \
   (loc &&                                                                      \
    ((loc->flags & (KMP_IDENT_ATOMIC_REDUCE)) == (KMP_IDENT_ATOMIC_REDUCE)))
 #define FAST_REDUCTION_TREE_METHOD_GENERATED ((reduce_data) && (reduce_func))
 
   retval = critical_reduce_block;