RFR: 8272228: G1: G1CardSetInlinePtr Remove unreliable assertion

[Ivan Walulya]

Hi all,

Please review this cleanup to remove unreliable asserts in G1CardSetInlinePtr.

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Commit messages:
 - remove asserts which always rereturn true

Changes: https://git.openjdk.java.net/jdk/pull/5069/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5069&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8272228
  Stats: 6 lines in 1 file changed: 0 ins; 4 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5069.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5069/head:pull/5069

PR: https://git.openjdk.java.net/jdk/pull/5069