[jdk15u-dev] RFR: 8261395: C1 crash "cannot make java calls from the native compiler"

[Vladimir Kempik]

Please review backport of JDK-8261395 to jdk15u-dev
Two chunks of instanceKlass.cpp wasn't applyting clean, slight mod were needed.
Testcase were adapted for jdk15 in testlibrary related header.
Test case fails before patch and passes after.

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Commit messages:
 - Backport e828a939a8155a3b4ab26811a405bb4e4b2b99e8

Changes: https://git.openjdk.java.net/jdk15u-dev/pull/63/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk15u-dev&pr=63&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8261395
  Stats: 226 lines in 4 files changed: 167 ins; 40 del; 19 mod
  Patch: https://git.openjdk.java.net/jdk15u-dev/pull/63.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk15u-dev pull/63/head:pull/63

PR: https://git.openjdk.java.net/jdk15u-dev/pull/63