RFR: 8255886: Shenandoah: Avoid register clash when calling LRB-runtime from interpreter

[Roman Kennke]

JDK-8255762 caused test failure on Windows because of overlapping argument registers in the LRB runtime call. The problem is more general, though, but hasn't manifested anywhere else.

Testing: hotspot_gc_shenandoah (linux: x86_64, x86_32, windows: x86_64)

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Commit messages:
 - 8255886: Shenandoah: Avoid register clash when calling LRB-runtime from interpreter

Changes: https://git.openjdk.java.net/jdk/pull/1054/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1054&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8255886
  Stats: 18 lines in 1 file changed: 10 ins; 0 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1054.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1054/head:pull/1054

PR: https://git.openjdk.java.net/jdk/pull/1054