RFR: 8260502: [s390] NativeMovRegMem::verify() fails because it's too strict [v2]

[Martin Doerr]

> "fatal error: this is not a `NativeMovRegMem' site" was observed while testing the debug build without CompressedOops.
> NativeMovRegMem::verify() tries to verify instructions beyond the load_const at a place at which we don't have valid instructions. See bug for details.
> I suggest to remove the wrong part of the verification.

Martin Doerr has updated the pull request incrementally with one additional commit since the last revision:

  Fix comment for NativeMovRegMem

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/2258/files
  - new: https://git.openjdk.java.net/jdk/pull/2258/files/54fa039c..f178b208

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2258&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2258&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2258.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2258/head:pull/2258

PR: https://git.openjdk.java.net/jdk/pull/2258