[jdk11u-dev] RFR: 8268882: C2: assert(n->outcnt() != 0 || C->top() == n || n->is_Proj()) failed: No dead instructions after post-alloc

[Martin Doerr]

Clean backport of JDK-8268882.

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

Commit messages:
 - Backport 0699220830a457959b784b35af125b70f43fa3b0

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/624/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=624&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268882
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/624.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/624/head:pull/624

PR: https://git.openjdk.java.net/jdk11u-dev/pull/624