RFR: 8305668: PPC: Non-Top Interpreted frames should be independent of ABI_ELFv2

[Richard Reingruber]

This PR makes parent interpreted Java frames independent of `ABI_ELFv2`.
With the changes `test/jdk/jdk/internal/vm/Continuation/BasicExt.java#COMP_ALL` succeeds on PPC64 Big Endian Linux.

Before:

* `parent_ijava_frame_abi` was derived from `abi_minframe` which depends on `ABI_ELFv2`
* jit_abi is independent of `abi_minframe`
* `frame::metadata_words` is wrong for `parent_ijava_frame_abi` if `ABI_ELFv2` is not defined (big endian)

After changes:

* prefixed structs that depend on `ABI_ELFv2` with `native_`
* introduced `java_abi` which is independent of `ABI_ELFv2`
* `frame::metadata_words` is the size in words of `java_abi`

This is still a little imprecise since `top_ijava_frame_abi` is larger than `java_abi` but the top frame is never frozen as it is always `vmIntrinsics::_Continuation_doYield`

Testing:

PPC64le: most JCK and JTREG tiers 1-4, also in Xcomp mode.
PPC64be Linux: hotspot tier1 tests

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Commit messages:
 - Update comments
 - Rename abi_reg_args_spill -> native_abi_reg_args_spill
 - Use correct abi definitions
 - Rename native abi size enum elements
 - Introduce common_abi
 - Derive parent_ijava_frame_abi from java_abi
 - java_abi
 - Native abi structs

Changes: https://git.openjdk.org/jdk/pull/13372/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13372&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8305668
  Stats: 146 lines in 21 files changed: 13 ins; 13 del; 120 mod
  Patch: https://git.openjdk.org/jdk/pull/13372.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13372/head:pull/13372

PR: https://git.openjdk.org/jdk/pull/13372