RFR: 8263769: simplify PhaseMacroExpand::extract_call_projections() [v2]

[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:

  8263769: simplify PhaseMacroExpand::extract_call_projections()
  
  replace individual call projects with a POD object _call_projects.
  replace PhaseMacroExpand::extract_call_projections() with CallNode::extract_projections().

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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/3910fd3f..509fe236

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3105&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3105&range=00-01

  Stats: 139 lines in 3 files changed: 0 ins; 25 del; 114 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