RFR: 8305757: Call Method::compute_has_loops_flag() when creating CDS archive

[Ioi Lam]

A simple optimization -- call Method::compute_has_loops_flag() for all methods during CDS archive dump. This way, the JIT doesn't need to do this at runtime.

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Commit messages:
 - 8305757: Call Method::compute_has_loops_flag() when creating CDS archive

Changes: https://git.openjdk.org/jdk/pull/13390/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13390&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8305757
  Stats: 4 lines in 1 file changed: 4 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/13390.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13390/head:pull/13390

PR: https://git.openjdk.org/jdk/pull/13390