RFR: 8198474: Move JNIHandles::resolve into jniHandles.inline.hpp

[Kim Barrett]

Please review this change to split jniHandles.hpp, moving the inline
definition of JNIHandles::resolve and related functions to the new
jniHandles.inline.hpp.  This is being done in preparation for
JDK-8195972 "Refactor oops in JNI to use the Access API".  This is
needed so we can include access.inline.hpp as part of that change,
making the implementation of Access available for reference by
JNIHandles::resolve &etc.

This was accomplished largly by a simple copy of the code, and
updating the #includes of lots of files.  However,
resolve_external_guard was changed to no longer be inline.  It doesn't
seem to be performance critical, and this change reduced the fanout on
#include updates.

CR:
https://bugs.openjdk.java.net/browse/JDK-8198474

Webrev:
http://cr.openjdk.java.net/~kbarrett/8198474/open.00/
[Note to Oracle reviewers: There is a closed part to this change too.]

Testing:
hs-tier1 in isolation
{hs,jdk}-tier{1,2,3} JDK-8195972 as part of changes for JDK-8195972