RFR: 8276711: compiler/codecache/cli tests failing when SegmentedCodeCache used with -Xint

[Coleen Phillimore]

In Loom, when using -Xint, the +SegmentedCodeCache option cannot be used because it doesn't generate a code heap for nmethods, and in loom the compiler needs to generate an nmethod for Continuation.enterSpecial even with -Xint.
This change is @rickard 's loom change with the tests fixed so they pass for it.  One tests for the new warning message and code cache usage, and the others remove the Xint tests.
Tested with tier1-4.

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Commit messages:
 - 8276711: compiler/codecache/cli tests failing when SegmentedCodeCache used with -Xint

Changes: https://git.openjdk.java.net/jdk/pull/7650/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7650&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8276711
  Stats: 29 lines in 4 files changed: 11 ins; 11 del; 7 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7650.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7650/head:pull/7650

PR: https://git.openjdk.java.net/jdk/pull/7650