[jdk11u-dev] RFR: 8273804: Platform.isTieredSupported should handle the no-compiler case

[Kangcheng Xu]

a clean backport of [JDK-8273804](https://bugs.openjdk.org/browse/JDK-8273804).

-------------

Commit messages:
 - 8273804: Platform.isTieredSupported should handle the no-compiler case

Changes: https://git.openjdk.org/jdk11u-dev/pull/2201/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2201&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8273804
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2201.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2201/head:pull/2201

PR: https://git.openjdk.org/jdk11u-dev/pull/2201