[jdk15u-dev] RFR: 8290451: Incorrect result when switching to C2 OSR compilation from C1

[Yuri Nesterenko]

Clean backport of a C2 change for parity with LTS releases. Compiler tests do pass.

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Commit messages:
 - Backport afa5d4ced38b7f3752932c28af96d8fc600d1df7

Changes: https://git.openjdk.org/jdk15u-dev/pull/309/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk15u-dev&pr=309&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8290451
  Stats: 113 lines in 3 files changed: 112 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk15u-dev/pull/309.diff
  Fetch: git fetch https://git.openjdk.org/jdk15u-dev pull/309/head:pull/309

PR: https://git.openjdk.org/jdk15u-dev/pull/309