[code-reflection] RFR: Disallow insertion of a root op in a block [v4]

[Mourad Abbay]

> A root operation shouldn't be inserted in a block. This changes enforce this rule.

Mourad Abbay has updated the pull request incrementally with one additional commit since the last revision:

  Remove trace of previous attempt

-------------

Changes:
  - all: https://git.openjdk.org/babylon/pull/425/files
  - new: https://git.openjdk.org/babylon/pull/425/files/83b4c5c8..7a65608c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=babylon&pr=425&range=03
 - incr: https://webrevs.openjdk.org/?repo=babylon&pr=425&range=02-03

  Stats: 7 lines in 2 files changed: 0 ins; 6 del; 1 mod
  Patch: https://git.openjdk.org/babylon/pull/425.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/425/head:pull/425

PR: https://git.openjdk.org/babylon/pull/425