RFR: 8284903: Fix typos in hotspot

[Magnus Ihse Bursie]

I ran `codespell` on hotspot, and accepted those changes where it indeed discovered real typos. 

You'd be surprised over the many implementions of instrinsics and other intructions accross all archtectures I've encounted, so for the preceding reason it's neccesery to sucessfully seach for exisiting typos...

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Commit messages:
 - Pass #2
 - Pass #1 in shared code
 - Pass #1 in platform-specific code

Changes: https://git.openjdk.java.net/jdk/pull/8260/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8260&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8284903
  Stats: 910 lines in 446 files changed: 0 ins; 0 del; 910 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8260.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8260/head:pull/8260

PR: https://git.openjdk.java.net/jdk/pull/8260