RFR: 8331861: [PPC64] Implement load / store assembler functions which take an Address object

[Varada M]

Load and store assembly instructions which takes Address object as argument. 

Tier 1 testing successful on linux-ppc64le and aix-ppc (fastdebug level)

JBS : [JDK-8331861](https://bugs.openjdk.org/browse/JDK-8331861)

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

Commit messages:
 - 8331861: [PPC64] Implement load / store assembler functions which take an Address object
 - 8331861: [PPC64] Implement load / store assembler functions which take an Address object
 - 8331861: [PPC64] Implement load / store assembler functions which take an Address object
 - 8331861: [PPC64] Implement load / store assembler functions which take an Address object
 - 8331861: [PPC64] Implement load / store assembler functions which take an Address object
 - JDK-8331861: [PPC64] Implement load / store assembler functions which take an Address object
 - JDK-8331861

Changes: https://git.openjdk.org/jdk/pull/21492/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21492&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8331861
  Stats: 70 lines in 4 files changed: 41 ins; 0 del; 29 mod
  Patch: https://git.openjdk.org/jdk/pull/21492.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21492/head:pull/21492

PR: https://git.openjdk.org/jdk/pull/21492