RFR: JDK-8279956: Useless method Scheduling::ComputeLocalLatenciesForward() [v3]

[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.

SUN Guoyun has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  8279956: Useless method Scheduling::ComputeLocalLatenciesForward( )

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7062/files
  - new: https://git.openjdk.java.net/jdk/pull/7062/files/5dd1af8f..b6c8b7e1

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7062&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7062&range=01-02

  Stats: 0 lines in 0 files changed: 0 ins; 0 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