RFR: 8266330: itableMethodEntry::initialize() asserts with archived old classes [v2]

[Calvin Cheung]

> #ifdef ASSERT 
>   if (MetaspaceShared::is_in_shared_metaspace((void*)&_method) && 
>      !MetaspaceShared::remapped_readwrite() && 
>      !MetaspaceShared::is_old_class(m->method_holder())) { 
>     // At runtime initialize_itable is rerun as part of link_class_impl() 
>     // for a shared class loaded by the non-boot loader. 
>     // The dumptime itable method entry should be the same as the runtime entry. 
>     assert(_method == m, "sanity"); 
>   } 
> #endif
> 
> 
> The above includes the check for !MetaspaceShared::is_old_class(m->method_holder()).
> While the method_holder() is not an old class, the _klass in the klassITable could be an old class.
> The proposed fix is to have the caller of the above function pass in the _klass and add another check
> making sure the _klass is not an old class before the assert.
> 
> Testing:
> - [x] tiers 1 and 2 (including the new test)

Calvin Cheung has updated the pull request incrementally with one additional commit since the last revision:

  fix minor nit

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3930/files
  - new: https://git.openjdk.java.net/jdk/pull/3930/files/6b83ea9f..6d31bae8

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3930&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3930&range=00-01

  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3930.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3930/head:pull/3930

PR: https://git.openjdk.java.net/jdk/pull/3930