RFR: 8241502: C2: Migrate x86_64.ad to MacroAssembler [v10]

[John Tortugo]

> Relates to: https://bugs.openjdk.java.net/browse/JDK-8241502
> Tested on: Linux tier1, 2 and 3
> 
> Can you please take a look whether these changes are going in the direction expected or not? If it is, I'll continue working on the `JDK-8241502` but I'd like to split it in a few PRs since it's a lot of changes.

John Tortugo has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 14 additional commits since the last revision:

 - Merge pull request #3 from JohnTortugo/master
   
   Updating branch with latest changes in upstream/master
 - Merge pull request #2 from openjdk/master
   
   Fork updating
 - Encode cdql/cdqq using MacroAssembler.
 - Fix cast of constant
 - Use cdql/cdqq implemented in MacroAssembler.
 - All conversions performed and tested.
 - More shifts; logic operations and movs.
 - Some div and shift instructions.
 - Third part of conversions. Small fix in Assembler::cmovl.
 - Second part of conversions.
 - ... and 4 more: https://git.openjdk.java.net/jdk/compare/c9ae2fa3...53a5e32b

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/2420/files
  - new: https://git.openjdk.java.net/jdk/pull/2420/files/92a242b0..53a5e32b

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2420&range=09
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2420&range=08-09

  Stats: 746030 lines in 10204 files changed: 162042 ins; 553344 del; 30644 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2420.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2420/head:pull/2420

PR: https://git.openjdk.java.net/jdk/pull/2420