RFR: 8279675: CDS cannot handle non-existent JAR file in bootclassapth

[Calvin Cheung]

Non-existent boot class path and file with zero size won't be recorded during CDS dump time.
This fix excludes checking of the above paths and files during runtime to avoid a false mismatch.

The proposed fix passed CI tiers 1-4 testing.

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Commit messages:
 - 8279675: CDS cannot handle non-existent JAR file in bootclassapth

Changes: https://git.openjdk.java.net/jdk/pull/7169/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7169&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8279675
  Stats: 130 lines in 5 files changed: 115 ins; 8 del; 7 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7169.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7169/head:pull/7169

PR: https://git.openjdk.java.net/jdk/pull/7169