[master] RFR: Load Klass* from header in interpreter (x86) [v3]

[Roman Kennke]

> This implements loading the compressed Klass* from the object header, instead of the Klass* field in the x86 interpreter. It does the fast-path (unlocked object) in assembly, and calls into the runtime to deal with locked objects.
> 
> Testing:
>  - [x] tier1
>  - [x] tier2
>  - [x] hotspot_gc

Roman Kennke has updated the pull request incrementally with one additional commit since the last revision:

  Use constant instead of literal in xor-test-sequence

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

Changes:
  - all: https://git.openjdk.java.net/lilliput/pull/15/files
  - new: https://git.openjdk.java.net/lilliput/pull/15/files/99f9a36b..a7ac46c0

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=lilliput&pr=15&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=lilliput&pr=15&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/lilliput/pull/15.diff
  Fetch: git fetch https://git.openjdk.java.net/lilliput pull/15/head:pull/15

PR: https://git.openjdk.java.net/lilliput/pull/15