tests: Classify new Go 1.9 tests.
tests: Classify new Go 1.9 tests.

The fixedbugs/issue19182.go test requires GOMAXPROCS=2, otherwise it
never terminates. Avoid running it, since GopherJS only supports
GOMAXPROCS=1.

The fixedbugs/issue19246.go case looks similar to #551. /cc @neelance

Check knownFails table before potentially setting test.err to nil for
skip errors. Otherwise the never-terminate skip tests get incorrectly
classified as "unok" instead of "knfl".

gopherjs/gopherjs,gopherjs/gopherjs,gopherjs/gopherjs,gopherjs/gopherjs,gopherjs/gopherjs