RFR: JDK-8279956: Useless method Scheduling::ComputeLocalLatenciesForward()

[SUN Guoyun]

Method Scheduling::ComputeLocalLatenciesForward() be used for compute the latency of all the instructions and write the result to _node_latency. But I found that _node_latency was never used. So I think method Scheduling::ComputeLocalLatenciesForward() can be deleted, which is also an enhancement to the efficiency of compilation threads.

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Commit messages:
 - 8279956: Useless method Scheduling::ComputeLocalLatenciesForward()

Changes: https://git.openjdk.java.net/jdk/pull/7062/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7062&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8279956
  Stats: 67 lines in 1 file changed: 6 ins; 61 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7062.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7062/head:pull/7062

PR: https://git.openjdk.java.net/jdk/pull/7062