RFR: 8290981: Enable CDS for zero builds [v6]

[Ioi Lam]

> Enable CDS for zero builds. `java --version` is about 2x faster now.
> 
> 
> $ perf stat -r 40 ./images/jdk/bin/java -Xshare:off -version
> 0.034645 +- 0.000044 seconds time elapsed  ( +-  0.13% )
> $ perf stat -r 40 ./images/jdk/bin/java -version
> 0.018080 +- 0.000388 seconds time elapsed  ( +-  2.15% )
> 
> I also fixed a bug in Images.gmk that always wrote the default archive to $JAVA_HOME/lib/server. This fix also makes it possible for a client libjvm to have a default CDS archive.

Ioi Lam has updated the pull request incrementally with one additional commit since the last revision:

  added !UseSharedSpaces back to _fast_invokevfinal check

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/9869/files
  - new: https://git.openjdk.org/jdk/pull/9869/files/eb0e295d..8e4bef9d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9869&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9869&range=04-05

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/9869.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9869/head:pull/9869

PR: https://git.openjdk.org/jdk/pull/9869