RFR: 8282204: Use lea instructions for arithmetic operations on x86_64 [v12]

[Quan Anh Mai]

> Hi,
> 
> This patch adds several matching rules for x86_64 backend to use `lea` instructions for several fused arithmetic operations. Also, `lea`s don't kill flags and allow different `dst` and `src`, so it is preferred over `sll` if possible, too. 
> 
> Thank you very much.

Quan Anh Mai 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 12 additional commits since the last revision:

 - Merge branch 'master' into leaIns
 - reviews
 - remove unreached rules
 - remove 0x67 prefix
 - address reviews
 - remove irrelevent changes
 - reviews
 - address reviews
 - add benchmark
 - add predicate
 - ... and 2 more: https://git.openjdk.java.net/jdk/compare/6b57a825...e0fd81f6

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7560/files
  - new: https://git.openjdk.java.net/jdk/pull/7560/files/669dea58..e0fd81f6

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7560&range=11
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7560&range=10-11

  Stats: 32166 lines in 878 files changed: 21235 ins; 5960 del; 4971 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7560.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7560/head:pull/7560

PR: https://git.openjdk.java.net/jdk/pull/7560