RFR: 8369804: TestGenerators.java fails with IllegalArgumentException: bound must be greater than origin [v2]

[Emanuel Peter]

> We sample two floats, assuming we would get two different results. But ever so rarely, we get the same values, and the test fails.
> 
> So now, I sample with retry. And also improve the error reporting, throwing an exception on generator construction rather than sampling from the generator.

Emanuel Peter has updated the pull request incrementally with one additional commit since the last revision:

  Apply suggestions from code review

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Changes:
  - all: https://git.openjdk.org/jdk/pull/27816/files
  - new: https://git.openjdk.org/jdk/pull/27816/files/9cc9b1ff..34e6fd55

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27816&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27816&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/27816.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27816/head:pull/27816

PR: https://git.openjdk.org/jdk/pull/27816