RFR: 6542: Improve calls to render in the flame view [v10]

[Miroslav Wengner]

> stable flameview generation

Miroslav Wengner has updated the pull request incrementally with one additional commit since the last revision:

  6542: cleanup

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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/6c78deb9..6c307ea3

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmc&pr=78&range=09
 - incr: https://webrevs.openjdk.java.net/?repo=jmc&pr=78&range=08-09

  Stats: 60 lines in 1 file changed: 1 ins; 47 del; 12 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