Index: external/bsd/llvm/librt/libLLVMSupport/../../lib/../dist/llvm/lib/Support/Unix/Memory.inc
===================================================================
RCS file: /cvsroot/src/external/bsd/llvm/dist/llvm/lib/Support/Unix/Memory.inc,v
retrieving revision 1.1.1.9
diff -p -u -r1.1.1.9 Memory.inc
--- external/bsd/llvm/librt/libLLVMSupport/../../lib/../dist/llvm/lib/Support/Unix/Memory.inc	17 Jul 2018 18:33:35 -0000	1.1.1.9
+++ external/bsd/llvm/librt/libLLVMSupport/../../lib/../dist/llvm/lib/Support/Unix/Memory.inc	7 Jun 2019 11:18:48 -0000
@@ -174,8 +174,12 @@ Memory::protectMappedMemory(const Memory
   // Certain ARM implementations treat icache clear instruction as a memory read,
   // and CPU segfaults on trying to clear cache on !PROT_READ page.  Therefore we need
   // to temporarily add PROT_READ for the sake of flushing the instruction caches.
-  if (InvalidateCache && !(Protect & PROT_READ)) {
-    int Result = ::mprotect((void *)Start, End - Start, Protect | PROT_READ);
+  int ExtraProtect = PROT_READ;
+#ifdef __NetBSD__
+  ExtraProtect |= PROT_WRITE;
+#endif
+  if (InvalidateCache && (Protect & ExtraProtect) != ExtraProtect) {
+    int Result = ::mprotect((void *)Start, End - Start, Protect | ExtraProtect);
     if (Result != 0)
       return std::error_code(errno, std::generic_category());