[test] Process to locally develop and upstream test262 tests

test/test262/upstream-local-tests.sh

+# usage: test/test262/upstream-local-tests.sh
+# This script takes the files which were modified in the test262 local-test
+# directory (test/test262/local-tests) in the top patch of the v8 tree and
+# creates a new patch in the local test262 checkout (test/test262/data).
+# This patch could then hopefully be used for upstreaming tests.
+# The script should be run from the top level directory of the V8 checkout.
+
+git show | grep '+++ b/test/test262/local-tests' | while read test; do
+  path=${test:6}
+  datapath=${path/local-tests/data}
+  echo cp $path $datapath
+  cp $path $datapath
+  cd test/test262/data
+  git add ${datapath:18} || exit 1
+  cd ../../../
+done
+cd test/test262/data
+git commit || exit 1