RFR: 8263769: simplify PhaseMacroExpand::extract_call_projections() [v3]

[Xin Liu]

> PhaseMacroExpand::extract_call_projections(macro.cpp) is almost identical to 
> CallNode::extract_projections(callnode.cpp). The implementation can be replaced
> by CallNode::extract_projections.

Xin Liu has updated the pull request incrementally with one additional commit since the last revision:

  Rename PhaseMacroExpand::_call_projects to PhaseMacroExpand::_callprojs.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3105/files
  - new: https://git.openjdk.java.net/jdk/pull/3105/files/509fe236..b5748eea

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3105&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3105&range=01-02

  Stats: 107 lines in 3 files changed: 0 ins; 0 del; 107 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3105.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3105/head:pull/3105

PR: https://git.openjdk.java.net/jdk/pull/3105