[OpenMP][Fix] Ensure comparison between unsigned values.

Summary: Ensure the values being compared are both unsigned.

Reviewers: ABataev, Hahnfeld, caomhin, grokos, AndreyChurbanov

Reviewed By: AndreyChurbanov

Subscribers: AndreyChurbanov, guansong, openmp-commits

Differential Revision: https://reviews.llvm.org/D51301

git-svn-id: https://llvm.org/svn/llvm-project/openmp/trunk@340745 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/runtime/src/kmp_gsupport.cpp b/runtime/src/kmp_gsupport.cpp
index 297a8f7..e218018 100644
--- a/runtime/src/kmp_gsupport.cpp
+++ b/runtime/src/kmp_gsupport.cpp
@@ -1001,7 +1001,7 @@
           KMP_DISPATCH_NEXT_ULL(&loc, gtid, NULL, (kmp_uint64 *)p_lb,          \
                                 (kmp_uint64 *)p_ub, (kmp_int64 *)&stride);     \
       if (status) {                                                            \
-        KMP_DEBUG_ASSERT((long long)stride == str);                            \
+        KMP_DEBUG_ASSERT(stride == str);                                       \
         *p_ub += (str > 0) ? 1 : -1;                                           \
       }                                                                        \
     } else {                                                                   \