RFR: 8294514: Wrong initialization of nmethod::_consts_offset for native nmethods

[Richard Reingruber]

Hi,

this small fix copies the initialization of `nmethod::_consts_offset` from the nmethod constructor for c1/c2 compiled nmethods to the constructor for native nmethods.

Manual testing:

* I built commit 86097e20df0652c2f0c6865f0ec62e7989db45ca and reproduced the issue on x86_64 as described in the JBS-bug
* Then I build commit 5ce7741ffd9323909b7424255d696525db3d01d2 and found that I could not reproduce the issue. I also verified that on PPC64 the constants section of the continuation enter intrinsic is printed now (-XX:+PrintAssembly).

The fix passed our CI testing: most JCK and JTREG test, also in Xcomp mode, SPECjvm2008, SPECjbb2015, Renaissance Suite and SAP specific tests with fastdebug and release builds on the standard platforms plus PPC64.

Thanks, Richard.

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Commit messages:
 - Revert "DEBUG: print size of consts section if negative"
 - Fix initialization of nmethod::_consts_offset
 - DEBUG: print size of consts section if negative

Changes: https://git.openjdk.org/jdk/pull/10482/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10482&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8294514
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/10482.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10482/head:pull/10482

PR: https://git.openjdk.org/jdk/pull/10482