RFR: 8273020: LibraryCallKit::sharpen_unsafe_type does not handle narrow oop array

[Tobias Hartmann]

The array handling code in `LibraryCallKit::sharpen_unsafe_type` does not work with narrow oop arrays because `isa_oopptr` returns `NULL`. Instead, `make_oopptr` should be used.

I've only noticed this while working on Valhalla, I don't think there is any impact on mainline code.

Thanks,
Tobias

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Commit messages:
 - 8273020: LibraryCallKit::sharpen_unsafe_type does not handle narrow oop array

Changes: https://git.openjdk.java.net/jdk/pull/5265/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5265&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8273020
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5265.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5265/head:pull/5265

PR: https://git.openjdk.java.net/jdk/pull/5265