RFR: Merge jdk20

Forwardport JDK 20 -> JDK 21 - Commit messages: - Merge remote-tracking branch 'jdk20/master' into Merge_jdk20 - 8298400: Virtual thread instability when stack overflows - 8300490: Spaces in name of MacOS Code Signing Identity are not correctly handled after JDK-8293550 The webre

RFR: Merge jdk20

Forwardport JDK 20 -> JDK 21 - Commit messages: - Merge remote-tracking branch 'jdk20/master' into Merge_jdk20 - 8299705: JCov coverage runs depend on jdk_symbols - 8299740: CaptureCallState is missing @Preview annotation - 8299528: IR test: TestEor3AArch64.java fails on aarch64

RFR: Merge jdk20

Forwardport JDK 20 -> JDK 21 - Commit messages: - Merge remote-tracking branch 'jdk20/master' into Merge_jdk20 - 8299476: PPC64 Zero build fails after JDK-8286302 - 8293824: gc/whitebox/TestConcMarkCycleWB.java failed "RuntimeException: assertTrue: expected true, was false" - 829

RFR: Merge jdk20

Forwardport JDK 20 -> JDK 21 - Commit messages: - Merge remote-tracking branch 'jdk20/master' into Merge_jdk20 - 8298893: Rename option UsePolyIntrinsics to UsePoly1305Intrinsics - 8298726: (fs) Change PollingWatchService to record last modified time as FileTime rather than millis

RFR: Merge jdk20

Forwardport JDK 20 -> JDK 21 - Commit messages: - Merge - 8298797: Specification of some restricted methods is incorrect - 8287699: jdk/jfr/api/consumer/TestRecordingFileWrite.java fails with exception: java.lang.Exception: Found event that should not be there. - 8297979: ZGC: En

RFR: Merge jdk20

Forwardport JDK 20 -> JDK 21 - Commit messages: - Merge remote-tracking branch 'jdk20/master' into Merge_jdk20 - 8297235: ZGC: assert(regs[i] != regs[j]) failed: Multiple uses of register: rax - 8298649: JFR: RemoteRecordingStream support for checkpoint event sizes beyond u4 - 8

RFR: Merge jdk20

Forwardport JDK 20 -> JDK 21 - Commit messages: - Merge remote-tracking branch 'jdk20/master' into Merge_jdk20 - 8298084: Memory leak in Method::build_profiling_method_data - 8296955: Kitchensink.java failed with "double free or corruption (!prev): " - 8298488: [macos13] tools/jp

RFR: Merge jdk20

Forwardport JDK 20 -> JDK 21 - Commit messages: - Merge remote-tracking branch 'jdk20/master' into Merge_jdk20 - 8297288: Example code in Scanner class - 8298271: java/security/SignedJar/spi-calendar-provider/TestSPISigned.java failing on Windows - 8298459: Fix msys2 linking and