[jdk11u-dev] RFR: 8242310: use reproducible random in hotspot compiler tests

[Goetz Lindenmaier]

I backport this for parity with 11.0.16-oracle.

I had to adapt the change in some places, all quite trivial:

TestTrichotomyExpressions.java
TestShift.java
Vec_MulAddS2I.java
These tests are not in 11. Skipped.

ClearDirectivesFileStackTest.java
Resolved Copyright.

UnsafeIntrinsicsTest.java
A later change doubling the test description was already backported. 
Applying the patch was trivial.

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Commit messages:
 - Backport 7c351405c4a43c8af40a63f63b70bfcb7719b570

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/930/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=930&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8242310
  Stats: 271 lines in 91 files changed: 118 ins; 22 del; 131 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/930.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/930/head:pull/930

PR: https://git.openjdk.java.net/jdk11u-dev/pull/930