[libc++] Use _LIBCPP_ASSERT by default for _PSTL_ASSERTions

Reviewed By: ldionne, #libc

Spies: jwakely, rodgert, libcxx-commits

Differential Revision: https://reviews.llvm.org/D125634

GitOrigin-RevId: 64748efc27406244496e0c2ee6714e76b794c277
diff --git a/include/pstl/internal/pstl_config.h b/include/pstl/internal/pstl_config.h
index 80a1f9a..ad0cb5d 100644
--- a/include/pstl/internal/pstl_config.h
+++ b/include/pstl/internal/pstl_config.h
@@ -27,7 +27,12 @@
 #    define _PSTL_USAGE_WARNINGS
 #endif
 
-#if !defined(_PSTL_ASSERT)
+#if defined(_LIBCPP_VERSION)
+#    include <__assert>
+#    define _PSTL_ASSERT(pred) _LIBCPP_ASSERT(pred, "")
+#elif defined(__GLIBCXX__)
+#    define _PSTL_ASSERT(pred) __glibcxx_assert(pred)
+#else
 #    include <cassert>
 #    define _PSTL_ASSERT(pred) (assert((pred)))
 #endif