RFR: 8296886: Fix various include sort order issues [v2]

[Stefan Karlsson]

> The sorted blocks of includes have deteriorated to the point that I felt compelled to clean up some of the issues.
> 
> One of the more prevalent issues is that files in src/hotspot/share/include are not properly sorted. There has been some discussion that that was done on purpose, but it just adds another exception to the include rules that don't have any practical purposes, IMHO. It also goes against our written style guide around include files. One argument why it was OK have the files in include/ pushed up to the top of the sorted block, was that the file was included without specifying a directory. That's an argument that contradicts how we treat platform-dependent files, which (unfortunately) often also are specified without a prefixed directory, so I don't think that's a good enough argument, again IMHO. To remove this special case, I've removed the extraneous make file entry to have src/hotspot/share/include in the set of directories to search for headers when compiling HotSpot. Now all the header files in src/hotspot/share/include gets included by specifying the path from src/hotspot/share,
  just like the other platform-independent headers in HotSpot.
> 
> While going over the include headers I've also cleaned up surrounding whitespaces and incorrect include guards.

Stefan Karlsson has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains three commits:

 - Cleanups
 - Merge remote-tracking branch 'upstream/master' into various_include_order_fixes
 - Various include order fixes

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Changes: https://git.openjdk.org/jdk/pull/11108/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11108&range=01
  Stats: 323 lines in 116 files changed: 143 ins; 163 del; 17 mod
  Patch: https://git.openjdk.org/jdk/pull/11108.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11108/head:pull/11108

PR: https://git.openjdk.org/jdk/pull/11108