RFR: 8280872: Reorder code cache segments to improve code density

[Boris Ulasevich]

Currently the codecache segment order is [non-nmethod, non-profiled, profiled]. With this change we move the non-nmethod segment between two code segments. It changes nothing for any platform besides AARCH.

In AARCH the offset limit for a branch instruction is 128MB. The bigger jumps are encoded with three instructions. Most of far branches are jumps into the non-nmethod blobs. With the non-nmethod segment in between code segments the jump distance from method to the stub becomes shorter. The result is a 4% reduction in generated code size for the CodeCache range from 128MB to 240MB.

As a side effect, the performance of some tests is slightly improved:
``ArraysFill.testCharFill      10  thrpt   15  170235.720 -> 178477.212  ops/ms``

Testing: jdk/hotspot jtreg and microbenchmarks on AMD and AARCH

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Commit messages:
 - fix name: is_non_nmethod, adding target_needs_far_branch func
 - change codecache segments order: nonprofiled-nonmethod-profiled

Changes: https://git.openjdk.java.net/jdk/pull/7517/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7517&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8280872
  Stats: 108 lines in 7 files changed: 47 ins; 38 del; 23 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7517.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7517/head:pull/7517

PR: https://git.openjdk.java.net/jdk/pull/7517