Update to aarch64-shenandoah-jdk8u262-b10.
    
    Update release notes for 8u262 release.
    Remove issues in NEWS file duplicated between 8u252 & 8u262 releases.
    
    Update generate_source_tarball.sh script to use the PR3756 patch and retain the secp256k1 curve.
    Add the -'4curve' suffix to the tarball name.
    
    Adjust JDK-8143245/PR3548 patch following context changes due to JDK-8203287 for JFR
    Adjust RH1648644 following context changes due to introduction of JFR packages
    Split JDK-8042159 patch into per-repo patches as upstream.
    Update JDK-8042159 JDK patch to apply after JDK-8238002 changes to Awt2dLibraries.gmk
    Remove JDK-8244461 & JDK-8233880 backports included upstream in 8u262-b03.
    
    Enable JFR in our builds, ahead of upstream default.
    Add jfr binary to devel package and alternatives set
    Only enable JFR for JIT builds, as it is not supported with Zero.
    Turn off JFR on x86 for now due to assert(SerializePageShiftCount == count) crash.
    Explicitly list jfr.jar, default.jfc & profile.jfc in the spec file.
    Introduce jfr_arches for architectures which support JFR.
    Fix typo in jfr_arches which leads to ppc64 being wrongly excluded.
    With JDK-8248399 fixed, a broken jfr binary is no longer installed on architectures without JFR.
    
    Use sa_arches for libsaproc.so inclusion.
    
    Require tzdata 2020a so system tzdata matches resource updates in 8u262-b07