RFR: 8290027: Move inline functions from vm_version_x86.hpp to cpp

[Ioi Lam]

There are several large inline functions in vm_version_x86.hpp that are used only by vm_version_x86.cpp. E.g., `feature_flags()`

These should be moved to vm_version_x86.cpp to improve C++ build speed.

I manually diff'ed the lines that were moved between the two files. They were identical except for whitespaces.

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Commit messages:
 - 8290027: Move inline functions from vm_version_x86.hpp to cpp

Changes: https://git.openjdk.org/jdk/pull/9431/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9431&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8290027
  Stats: 638 lines in 2 files changed: 320 ins; 311 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/9431.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9431/head:pull/9431

PR: https://git.openjdk.org/jdk/pull/9431