RFR: 6542: Improve calls to render in the flame view [v11]

[Miroslav Wengner]

> stable flameview generation

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

 - 6542: additional cleanup
 - 6542: cleanup

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

Changes:
  - all: https://git.openjdk.java.net/jmc/pull/78/files
  - new: https://git.openjdk.java.net/jmc/pull/78/files/6c307ea3..92cff07b

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmc&pr=78&range=10
 - incr: https://webrevs.openjdk.java.net/?repo=jmc&pr=78&range=09-10

  Stats: 71 lines in 3 files changed: 0 ins; 25 del; 46 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