RFR: 8252658: G1: Do not consider G1HeapWastePercent during region selection within a gc

[Ivan Walulya]

"We agreed in an internal discussion to remove that check from region selection completely - the rationale is that when
we already started a (mixed) gc, we should evacuate as much as possible. So that check may at least moved out of the
loop or completely removed."

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Commit messages:
 - 8252658: G1: Do not consider G1HeapWastePercent during region selection within a gc

Changes: https://git.openjdk.java.net/jdk/pull/62/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=62&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8252658
  Stats: 16 lines in 1 file changed: 0 ins; 16 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/62.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/62/head:pull/62

PR: https://git.openjdk.java.net/jdk/pull/62