RFR: 8300830: Remove redundant assertion in src/hotspot/share/runtime/javaCalls.cpp

[David Holmes]

Trivial removal of redundant assertion: we previously set the state to _thread_in_Java so it can't be _thread_in_native.

Thanks.

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Commit messages:
 - 8300830: Remove redundant assertion in src/hotspot/share/runtime/javaCalls.cpp

Changes: https://git.openjdk.org/jdk/pull/12134/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12134&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8300830
  Stats: 3 lines in 1 file changed: 0 ins; 2 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/12134.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12134/head:pull/12134

PR: https://git.openjdk.org/jdk/pull/12134