RFC: Pick up 8u181 to sh/jdk8u

[Aleksey Shipilev]

Upstream had published 8u181 changes, let's pick them up to sh/jdk8u.

Hotspot changes are trivial and require one trivial merge:

     8207348: AArch64: backport 8207345: Trampoline generation code reads from uninitialized memory
     Added tag aarch64-jdk8u181-b03 for changeset 253b0c304db6
     Added tag aarch64-jdk8u181-b04 for changeset 8a75f5107626
     8038636: speculative traps break when classes are redefined
     8055008: Clean up code that saves the previous versions of redefined classes
     8078628: linux-zero does not build without precompiled header
     8169201: Montgomery multiply intrinsic should use correct name
     8187577: JVM crash during gc doing concurrent marking
     8188223: IfNode::range_check_trap_proj() should handler dying subgraph with single if proj
     8198794: Hotspot crash on Cassandra 3.11.1 startup with libnuma 2.0.3
     8199406: Performance drop with Java JDK 1.8.0_162-b32
     Fix hang on AArch64
     Added tag aarch64-jdk8u181-b13 for changeset 373cb5a46bc1
     Merge
     Added tag aarch64-jdk8u181-b14 for changeset 57a508e6d1c3


Testing: hotspot_tier3_gc_shenandoah {fastdebug|release}

Thanks,
-Aleksey