RFR: 8298993: (process) java/lang/ProcessBuilder/UnblockSignals.java fails [v2]

[Roger Riggs]

> It appears that -Xcomp causes the relative timing of the commands to be disturbed enough to prevent the correct operation of the test. The test should not be run with -Xcomp

Roger Riggs has updated the pull request incrementally with one additional commit since the last revision:

  Change reuqires to use @requires (vm.compMode != "Xcomp")

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13660/files
  - new: https://git.openjdk.org/jdk/pull/13660/files/e66b4970..ad2d13ea

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13660&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13660&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/13660.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13660/head:pull/13660

PR: https://git.openjdk.org/jdk/pull/13660