RFR: 8293035: Cleanup MacroAssembler::movoop code patching logic aarch64 riscv [v2]

[Axel Boldt-Christmas]

> Cleanup MacroAssembler::movoop logic with respect to code patching on aarch64 and riscv.
> 
> Remove the `bool immediate` argument as it is only used with the value `true` in `void MacroAssembler::movoop(Register dst, jobject obj, bool immediate)`
> 
> Make comments and logic more clear and easier to read.
> 
> Testing: osx, linux aarch64 tier 1-3

Axel Boldt-Christmas has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains two commits:

 - Merge remote-tracking branch 'upstream/master' into JDK-8293035
 - 8293035: Cleanup MacroAssembler::movoop code patching logic aarch64 riscv

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Changes: https://git.openjdk.org/jdk/pull/10065/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10065&range=01
  Stats: 47 lines in 13 files changed: 12 ins; 14 del; 21 mod
  Patch: https://git.openjdk.org/jdk/pull/10065.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10065/head:pull/10065

PR: https://git.openjdk.org/jdk/pull/10065