RFR: 8323095: Expand TraceOptoParse block output abbreviations

[Joshua Cao]

`e` -> `exception block`
`lphd` -> `loop head`

Also removing an unnecessary space. The successor ids have a space before them.

Examples from `java -Xcomp -XX:+TraceOptoParse -version`:


Parsing block #8 at bci [33,39), successors: 9 16(exception block)  loop head

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

Commit messages:
 - 8323095: Expand TraceOptoParse block output abbreviations

Changes: https://git.openjdk.org/jdk/pull/17289/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17289&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8323095
  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/17289.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17289/head:pull/17289

PR: https://git.openjdk.org/jdk/pull/17289