RFR: 8265132 : C2 compilation fails with assert "missing precedence edge" [v2]

[Jamsheed Mohammed C M]

> Issue is similar to https://bugs.openjdk.java.net/browse/JDK-8261730
> but happens at next https://github.com/jamsheedcm/jdk/blob/master/src/hotspot/share/opto/gcm.cpp#L830
> 
> Request for review

Jamsheed Mohammed C M has updated the pull request incrementally with one additional commit since the last revision:

  fixing issue related to raising LCA

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4200/files
  - new: https://git.openjdk.java.net/jdk/pull/4200/files/5a857f86..7e254c9b

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4200&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4200&range=00-01

  Stats: 4 lines in 1 file changed: 0 ins; 2 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4200.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4200/head:pull/4200

PR: https://git.openjdk.java.net/jdk/pull/4200