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

[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.

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Commit messages:
 - 8260502: [s390] NativeMovRegMem::verify() fails because it's too strict

Changes: https://git.openjdk.java.net/jdk/pull/2258/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2258&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8260502
  Stats: 27 lines in 1 file changed: 0 ins; 27 del; 0 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