RFR: 8260264: Move common os_<unix> inline methods to a common posix source file [v3]

[Harold Seigel]

> Please review this fix for JDK-8260264 to move common functions from os_<unix>.inline.hpp files to os_posix.inline.hpp.  Functions ftruncate() and the two numa* functions could also be moved to os_posix.inline.hpp but would require BSD_ONLY and AIX_ONLY macros because of minor differences.
> 
> The change was tested by running Mach5 tiers 1,2 on Linux, Mac OS, and Windows, and tiers 3-5 on Linux x64.  Additionally, builds were done on Linux-s390x, Linux-ppc, Linux-arm32, and linux-x86.
> 
> Thanks, Harold

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

  8260264: fix lseek64

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/2267/files
  - new: https://git.openjdk.java.net/jdk/pull/2267/files/d9597254..c5c24542

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2267&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2267&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2267.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2267/head:pull/2267

PR: https://git.openjdk.java.net/jdk/pull/2267