[code-reflection] RFR: Fix test failure after PR/51

[Maurizio Cimadamore]

A test is failing after my push of https://git.openjdk.org/babylon/pull/51

The problem is that I've tweaked the logic for parsing type-variables, so that now we check for a starting `#` in the core type factory.
But the `#` char is not copied into the identifier, hence the issue.

Unfortunately sometimes tests seem to pass even though they are run after a `make images`. The problem is that after changes in the `j.l.reflect.code` packages, only `java.base` is rebuilt, and the `jdk.compiler` copy is not. This means that, unless one does `make images` all the time, some tests might pass (or fail) spuriously. We might need to look at the build again.

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Commit messages:
 - Initial push

Changes: https://git.openjdk.org/babylon/pull/63/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=63&range=00
  Stats: 2 lines in 2 files changed: 0 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/babylon/pull/63.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/63/head:pull/63

PR: https://git.openjdk.org/babylon/pull/63