Adding use site null checks for method invocations. They are added by default but if option: `noUseSiteNullChecks` is passed, the compiler won't generate them
------------- Commit messages: - generate by default - add use site null checks Changes: https://git.openjdk.org/valhalla/pull/1910/files Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1910&range=00 Stats: 155 lines in 2 files changed: 147 ins; 0 del; 8 mod Patch: https://git.openjdk.org/valhalla/pull/1910.diff Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1910/head:pull/1910 PR: https://git.openjdk.org/valhalla/pull/1910
