[jdk11u-dev] RFR: 8263227: C2: inconsistent spilling due to dead nodes in exception block

[Martin Doerr]

JDK-8263227 should get backported for parity with 11.0.13-oracle. Doesn't apply cleanly, but resolution is trivial. disconnect_inputs in lcm.cpp needs an additional parameter for the feature to count edged which is not used here.

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Commit messages:
 - Backport d81b0461b73eeee648654ff04b2b71269932ad5a

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/60/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=60&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8263227
  Stats: 115 lines in 4 files changed: 107 ins; 0 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/60.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/60/head:pull/60

PR: https://git.openjdk.java.net/jdk11u-dev/pull/60