RFR: 8279545: Buffer overrun in reverse_words of sharedRuntime_x86_64.cpp:3517 [v2]

[Harold Seigel]

> Please review this small fix to prevent a potential integer overflow that can cause a buffer overrun.  The fix was tested with Mach5 tiers 1-2 on Linux, Mac OS, and Windows, Mach5 tiers 3-5 on Linux x64, and Mach5 builds of the JDK on PPC and S390.
> 
> Thanks, Harold

Harold Seigel has updated the pull request incrementally with one additional commit since the last revision:

  respond to review comments

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7053/files
  - new: https://git.openjdk.java.net/jdk/pull/7053/files/c570c10f..66425037

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7053&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7053&range=00-01

  Stats: 12 lines in 3 files changed: 6 ins; 0 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7053.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7053/head:pull/7053

PR: https://git.openjdk.java.net/jdk/pull/7053