RFR: 8331558: AArch64: optimize integer remainder [v9]

[Jin Guojie]

> 8331558: AArch64: optimize integer remainder
>     On some Arm processors, a separate multiply/subtract is actually faster than the combined instruction.
> 
> 8331556: AArch64: CPU_Model support for Neoverse N1/N2/V1/V2
>     Add full platform coverage for Neoverse variants in vm_version.?pp
> 
> The following test has passed, which shows definite performance improvement.
> 
> make test TEST="micro:java.lang.IntegerDivMod"
> make test TEST="micro:java.lang.LongDivMod"
> 
> * IntegerDivMod.testDivideRemainderUnsigned
> baseline(ns/ops)                2223
> with this pacth(ns/ops)         1885    
> improvement(%)                  17.93%
> 
> * IntegerDivMod.testRemainderUnsigned
> baseline(ns/ops)                2225
> with this pacth(ns/ops)         1885    
> improvement(%)                  18.03%
> 
> * LongDivMod.testDivideRemainderUnsigned
> baseline(ns/ops)                2231
> with this pacth(ns/ops)         1894    
> improvement(%)                  17.79%
> 
> * LongDivMod.testRemainderUnsigned
> baseline(ns/ops)                2232
> with this pacth(ns/ops)         1891
> improvement(%)                  18.03%

Jin Guojie has updated the pull request incrementally with two additional commits since the last revision:

 - Move big functions out of macroAssembler_aarch64.hpp
 - Fix is_neoverse()
   
   These macros (CPU_MODEL_NEOVERSE_N1...) are definitions of is_model, not _cpu.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/19093/files
  - new: https://git.openjdk.org/jdk/pull/19093/files/bb417893..2a16eba5

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19093&range=08
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19093&range=07-08

  Stats: 58 lines in 4 files changed: 28 ins; 25 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/19093.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19093/head:pull/19093

PR: https://git.openjdk.org/jdk/pull/19093