RFR: 8295270: RISC-V: Clean up and refactoring for assembler functions [v2]

[Fei Yang]

> Witnessed that some high-level assember functions are placed in file assembler_riscv.hpp/cpp,
> such as 'movptr', 'li' and so on. These are macro-assembler functions which should be placed
> in macroAssembler_riscv.hpp/cpp. Meanwhile, we should also move load & store memory and
> control assembler functions from address of type 'address' / 'Address'.
> 
> Testing: Tier1 hotspot on HiFive Unmatched board {fastdebug, release}.

Fei Yang has updated the pull request incrementally with one additional commit since the last revision:

  Fix name of locals

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Changes:
  - all: https://git.openjdk.org/jdk/pull/10697/files
  - new: https://git.openjdk.org/jdk/pull/10697/files/bf891cf3..c7672443

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10697&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10697&range=00-01

  Stats: 25 lines in 2 files changed: 0 ins; 0 del; 25 mod
  Patch: https://git.openjdk.org/jdk/pull/10697.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10697/head:pull/10697

PR: https://git.openjdk.org/jdk/pull/10697