RFR: 8355570: [s390x] Update -march to z13 generation [v2]

[Amit Kumar]

> updated march level from z10 to z13.
> 
> Testing: tier1 (fastdebug-vm)

Amit Kumar has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'master' into z13
 - z10 -> z15

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/24869/files
  - new: https://git.openjdk.org/jdk/pull/24869/files/0f3486ad..f14a22b9

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24869&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24869&range=00-01

  Stats: 66804 lines in 2080 files changed: 42720 ins; 13094 del; 10990 mod
  Patch: https://git.openjdk.org/jdk/pull/24869.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24869/head:pull/24869

PR: https://git.openjdk.org/jdk/pull/24869