RFR: 8263769: simplify PhaseMacroExpand::extract_call_projections() [v4]

[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:

  Improve codestyle based on PR's feedbacks.

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3105/files
  - new: https://git.openjdk.java.net/jdk/pull/3105/files/b5748eea..9e4668e0

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3105&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3105&range=02-03

  Stats: 14 lines in 2 files changed: 0 ins; 0 del; 14 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