RFR: 8340574: Drop stackMapTable.cpp to -O1 for MacOS on XCode 16 to work around JDK-8340341

[Thomas Stuefe]

Trivial change to drop the optimization level (for both fastdebug and release) of stackMapTable.cpp to O1 on MacOS with Xcode 16.

This is a workaround for https://bugs.openjdk.org/browse/JDK-8340341, which prevents building on MacOS.

Tested: with patch fastdebug and release builds are green again.

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Commit messages:
 - start

Changes: https://git.openjdk.org/jdk/pull/21119/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21119&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340574
  Stats: 5 lines in 1 file changed: 5 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/21119.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21119/head:pull/21119

PR: https://git.openjdk.org/jdk/pull/21119