RFR: 8332032: C2: Remove ExpandSubTypeCheckAtParseTime flag

[xiaotaonan]

C2: Remove ExpandSubTypeCheckAtParseTime flag

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Commit messages:
 - C2: Remove ExpandSubTypeCheckAtParseTime flag

Changes: https://git.openjdk.org/jdk/pull/19205/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19205&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8332032
  Stats: 10 lines in 4 files changed: 0 ins; 4 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/19205.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19205/head:pull/19205

PR: https://git.openjdk.org/jdk/pull/19205