remove compare and branch in fast path for c++ operator delete[]

Summary: sdallocx is checking a flag that will never be set (at least in the provided C++ destructor implementation).  This branch will probably only rarely be mispredicted however it removes two instructions in sdallocx and one at the callsite (to zero out flags).

src/jemalloc_cpp.cpp

@@ -128,14 +128,14 @@ operator delete(void *ptr, std::size_t size) noexcept {
 	if (unlikely(ptr == nullptr)) {
 		return;
 	}
-	je_sdallocx(ptr, size, /*flags=*/0);
+	je_sdallocx_noflags(ptr, size);
 }
 
 void operator delete[](void *ptr, std::size_t size) noexcept {
 	if (unlikely(ptr == nullptr)) {
 		return;
 	}
-	je_sdallocx(ptr, size, /*flags=*/0);
+	je_sdallocx_noflags(ptr, size);
 }
 
 #endif  // __cpp_sized_deallocation