[jdk17u] RFR: 8277529: SIGSEGV in C2 CompilerThread Node::rematerialize() compiling Packet::readUnsignedTrint

[Fairoz Matte]

JDK-8277529
SIGSEGV in C2 CompilerThread Node::rematerialize() compiling Packet::readUnsignedTrint

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Commit messages:
 - 8277529: SIGSEGV in C2 CompilerThread Node::rematerialize() compiling Packet::readUnsignedTrint

Changes: https://git.openjdk.java.net/jdk17u/pull/322/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u&pr=322&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8277529
  Stats: 173 lines in 3 files changed: 161 ins; 7 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk17u/pull/322.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u pull/322/head:pull/322

PR: https://git.openjdk.java.net/jdk17u/pull/322