RFR: WIP repalce stdout by configurable object [v8]

[Jiří Vaněk]

> See https://github.com/openjdk/asmtools/pull/38 for full story
> The PR will be enhanced by handling of two streams in compiler logger. Then the stdout work can continue.

Jiří Vaněk has updated the pull request incrementally with one additional commit since the last revision:

  Fixed typo which casued behavior regression
  
  found by unittests

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Changes:
  - all: https://git.openjdk.org/asmtools/pull/44/files
  - new: https://git.openjdk.org/asmtools/pull/44/files/14595d64..047e9706

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=asmtools&pr=44&range=07
 - incr: https://webrevs.openjdk.org/?repo=asmtools&pr=44&range=06-07

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/asmtools/pull/44.diff
  Fetch: git fetch https://git.openjdk.org/asmtools pull/44/head:pull/44

PR: https://git.openjdk.org/asmtools/pull/44