RFR: 8257709: C1: Double assignment in InstructionPrinter::print_stack [v2]

[Sergey Platonov]

> There is currently a minor bug (just a typo, actually) in the hotspot, leading
> to undefined behavior.

Sergey Platonov has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'master' into fix/hotspot-possible-ub
 - 8257709: C1: Double assignment in InstructionPrinter::print_stack
   
   There is currently a minor bug (just a typo, actually) in the hotspot, leading
   to undefined behavior.
   Issue: JDK-8257709: C1: Double assignment in InstructionPrinter::print_stack

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1519/files
  - new: https://git.openjdk.java.net/jdk/pull/1519/files/ca66b57a..c75652cd

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1519&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1519&range=00-01

  Stats: 96528 lines in 2605 files changed: 58391 ins; 19776 del; 18361 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1519.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1519/head:pull/1519

PR: https://git.openjdk.java.net/jdk/pull/1519