RFR: JDK-8310020: MacroAssembler::call_VM(_leaf) doesn't consistently check for conflict with C calling convention.

[Damon Fenacci]

# Issue
The `MacroAssembler::call_VM` and `MacroAssembler::call_VM_leaf` methods don't include asserts to check if the passed arguments collide with the C calling convention registers **consistently**. Some versions omit them completely (e.g. aarch64 `MacroAssembler::call_VM_leaf`), other ones use regular asserts (where the `assert_different_registers` function should be used).

# Solution
We use `assert_different_registers` across all `MacroAssembler::call_VM` and `MacroAssembler::call_VM_leaf` where a  check is needed (except for the arm implementation, which doesn't change as it uses fixed registers).

# Testing
This fix includes changes for x86_32/64 and aarch64, which I could test thoroughly but also for **ppc,** **riscv**, and **s390** for which I would **need some help with testing**.

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Commit messages:
 - JDK-8310020: MacroAssembler::call_VM_leaf doesn't consistently check for conflict with C calling convention.

Changes: https://git.openjdk.org/jdk/pull/14470/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14470&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8310020
  Stats: 114 lines in 5 files changed: 24 ins; 45 del; 45 mod
  Patch: https://git.openjdk.org/jdk/pull/14470.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14470/head:pull/14470

PR: https://git.openjdk.org/jdk/pull/14470