roll clang 239765:241602

build/config/compiler/BUILD.gn

Index: build/config/compiler/BUILD.gn
diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
index 56b79b560b4c67e730e1bcbc5db6519626b633b4..9d98fec96054e107efc0d57a920f0c0b6ab1060b 100644
--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -925,6 +925,17 @@ if (is_clang) {
       # TODO(hans): Get this cleaned up, http://crbug.com/428099
       "-Wno-inconsistent-missing-override",
     ]
+
+    if (exec_script("//tools/clang/scripts/update.py",
+                    [ "--print-revision" ],
+                    "trim string") != "239674-1") {
+      default_warning_flags += [
+        # TODO(thakis): Move this into outer if once clang is rolled far enough
+        # that the pinned clang understands this flag.
+        # TODO(thakis): Enable this, crbug.com/507717
+        "-Wno-shift-negative-value",
+      ]
+    }
   }
 }