[code-reflection] RFR: [hat] Compilation phases formatted with sub-phase

[Juan Fumero]

Compilation phases formatted with sub-phase in the logs. 

Example: 


[INFO] Code model before [HATDialectifyFP16Phase#dialectifyF16Stores]: 
func @loc="82:5:file: <CODE-MODEL> 
... 

[INFO] Code model after [HATDialectifyFP16Phase#dialectifyF16Stores]: 
func @loc="82:5:file: <NEW CODE MODEL>

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

Commit messages:
 - [hat] Compilation phases formatted with sub-phase

Changes: https://git.openjdk.org/babylon/pull/713/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=713&range=00
  Stats: 10 lines in 2 files changed: 1 ins; 5 del; 4 mod
  Patch: https://git.openjdk.org/babylon/pull/713.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/713/head:pull/713

PR: https://git.openjdk.org/babylon/pull/713