RFR: 8282355: compiler/arguments/TestCodeEntryAlignment.java failed "guarantee(sect->end() <= tend) failed: sanity"

[Dean Long]

This change adds extra stub space for large values of CodeEntryAlignment, and it changes the test to try large values of CodeEntryAlignment.

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Commit messages:
 - test large values of CodeEntryAlignment
 - Add extra stub space for large CodeEntryAlignment

Changes: https://git.openjdk.java.net/jdk/pull/7800/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7800&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8282355
  Stats: 10 lines in 2 files changed: 7 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7800.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7800/head:pull/7800

PR: https://git.openjdk.java.net/jdk/pull/7800