RFR: 8272520: Inline GenericTaskQueue::initialize() to the constructor [v2]

[Albert Mingkun Yang]

> Simple refactoring of GenericTaskQueue initialization API.
> 
> Test: tier1_gc

Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:

  review

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5125/files
  - new: https://git.openjdk.java.net/jdk/pull/5125/files/70f8c7c1..5376e921

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5125&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5125&range=00-01

  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5125.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5125/head:pull/5125

PR: https://git.openjdk.java.net/jdk/pull/5125