RFR: 8265245: depChecker_<cpu> don't have any functionalities

[Yi Yang]

Yet another OpenJDK6 old guy.

src/hotspot/cpu/<cpu>/depChecker_<cpu>.hpp/cpp are included by src/hotspot/share/compiler/disassembler.cpp, they don't provide any functionality.

In the absence of strong demand either in existing ARCHs or future ARCHs, I think we can remove it.

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Commit messages:
 - remove depcheck_<cpu>

Changes: https://git.openjdk.java.net/jdk/pull/3531/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3531&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8265245
  Stats: 305 lines in 13 files changed: 0 ins; 305 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3531.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3531/head:pull/3531

PR: https://git.openjdk.java.net/jdk/pull/3531