RFR: 8254769: Remove unimplemented BCEscapeAnalyzer::{add_dependence, propagate_dependencies}

[Aleksey Shipilev]

These methods are not implemented, and there were no definitions since the initial load. Can be removed.

Testing:
 - [x] Linux x86_64 build
 - [x] Text searches for `add_dependence` and `propagate_dependencies` in `src/hotspot`

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Commit messages:
 - 8254769: Remove unimplemented BCEscapeAnalyzer::{add_dependence, propagate_dependencies}

Changes: https://git.openjdk.java.net/jdk/pull/656/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=656&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8254769
  Stats: 2 lines in 1 file changed: 0 ins; 2 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/656.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/656/head:pull/656

PR: https://git.openjdk.java.net/jdk/pull/656