RFR: Reformat internal profiling stats

[Aleksey Shipilev]

For HelloWorld/javac workloads, the current output resolution in milliseconds is not enough, we better off printing microseconds. Plus, indenting is not agreeing in interpreter/C1/C2 outputs, fixed that as well.

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Commit messages:
 - Reformat internal profiling stats

Changes: https://git.openjdk.org/leyden/pull/18/files
  Webrev: https://webrevs.openjdk.org/?repo=leyden&pr=18&range=00
  Stats: 80 lines in 15 files changed: 17 ins; 0 del; 63 mod
  Patch: https://git.openjdk.org/leyden/pull/18.diff
  Fetch: git fetch https://git.openjdk.org/leyden.git pull/18/head:pull/18

PR: https://git.openjdk.org/leyden/pull/18