RFR: 6542: Improve calls to render in the flame view [v18]

[Miroslav Wengner]

> stable flameview generation

Miroslav Wengner has updated the pull request incrementally with two additional commits since the last revision:

 - 6542: cleanup unsused abstractions
 - 6542: correction, to speed up

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Changes:
  - all: https://git.openjdk.java.net/jmc/pull/78/files
  - new: https://git.openjdk.java.net/jmc/pull/78/files/534edf37..6968ba1c

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmc&pr=78&range=17
 - incr: https://webrevs.openjdk.java.net/?repo=jmc&pr=78&range=16-17

  Stats: 55 lines in 2 files changed: 9 ins; 36 del; 10 mod
  Patch: https://git.openjdk.java.net/jmc/pull/78.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/78/head:pull/78

PR: https://git.openjdk.java.net/jmc/pull/78