[jdk21u-dev] RFR: 8319197: Exclude hb-subset and hb-style from compilation

[Aleksey Shipilev]

Clean backport to improve JDK build times.

Yields a very reproducible improvement:


CONF=linux-x86_64-server-fastdebug make clean images   2484.89s user 417.72s system 2357% cpu 2:03.10 total
CONF=linux-x86_64-server-fastdebug make clean images   2481.81s user 417.23s system 2368% cpu 2:02.43 total
CONF=linux-x86_64-server-fastdebug make clean images   2487.89s user 417.50s system 2374% cpu 2:02.36 total

After:
CONF=linux-x86_64-server-fastdebug make clean images   2435.98s user 410.01s system 2538% cpu 1:52.10 total
CONF=linux-x86_64-server-fastdebug make clean images   2433.32s user 412.24s system 2546% cpu 1:51.75 total
CONF=linux-x86_64-server-fastdebug make clean images   2446.09s user 414.37s system 2535% cpu 1:52.81 total

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Commit messages:
 - Backport e1cae7203674bc288a63e6fb26f94b20e70c74fd

Changes: https://git.openjdk.org/jdk21u-dev/pull/769/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=769&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8319197
  Stats: 4 lines in 1 file changed: 3 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/769.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/769/head:pull/769

PR: https://git.openjdk.org/jdk21u-dev/pull/769