Bug 1692234 - Allow new pass manager with ubsan on clang 10.0.1+ r=firefox-build-system-reviewers,mhentges

The hang in 10.0.0 was fixed in trunk 11 and backported to 10.0.1.

Differential Revision: https://phabricator.services.mozilla.com/D104836

build/moz.configure/flags.configure

@@ -57,9 +57,9 @@ def new_pass_manager_flags(enabled, compiler, host, target, pgo, enable_fuzzing,
     if enable_fuzzing and compiler.version < "10.0.0":
         # Clang 9 does not seem to play well with libFuzzer
         return None
-    if ubsan and compiler.version >= "10.0.0":
-        # Temporary until https://bugs.llvm.org/show_bug.cgi?id=45835 gets a
-        # real fix: clang 10 hangs with some ubsan-inserted code constructs.
+    if ubsan and compiler.version == "10.0.0":
+        # Clang 10.0.0 hangs with some ubsan-inserted code constructs.
+        # This was fixed in 10.0.1 (https://llvm.org/pr45835)
         return None
     if enabled and compiler.version >= "9.0.0":
         if compiler.type == "clang":