[master] RFR: OMWorld: Remove BasicLock* restrictions [v4]

[Axel Boldt-Christmas]

> This is based on #159 
> 
> The main idea is to remove the restrictions where the `BasicLock*` may be missing when calling into the runtime. This is only an issue on x86_32. For now simply call into the runtime at the places where the registers are lacking. `quick_enter` should take care of the cases where we otherwise would have skipped calling into the runtime, as x86_32 calls into the runtime regardless (to get the thread) this may even be performance neutral.

Axel Boldt-Christmas has updated the pull request incrementally with one additional commit since the last revision:

  Add null check comment.

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Changes:
  - all: https://git.openjdk.org/lilliput/pull/160/files
  - new: https://git.openjdk.org/lilliput/pull/160/files/6778ef66..8dd759a4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=lilliput&pr=160&range=03
 - incr: https://webrevs.openjdk.org/?repo=lilliput&pr=160&range=02-03

  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/lilliput/pull/160.diff
  Fetch: git fetch https://git.openjdk.org/lilliput.git pull/160/head:pull/160

PR: https://git.openjdk.org/lilliput/pull/160