RFR: 8262901: [macos_aarch64] NativeCallTest expected:<-3.8194101E18> but was:<3.02668882E10>

[Olga Mikhaltsova]

This PR is opened as a follow-up for [1] and included the "must-done" fixes pointed by @teshull.

This patch for JVMCI includes the following fixes related to the macOS AArch64 calling convention:
1. arguments may consume slots on the stack that are not multiples of 8 bytes [2]
2. natural alignment of stack arguments [2]
3. stack must remain 16-byte aligned [3][4]

Tested with tier1 on macOS AArch64 and Linux AArch64.

[1] https://github.com/openjdk/jdk/pull/6641
[2] https://developer.apple.com/documentation/xcode/writing-arm64-code-for-apple-platforms
[3] https://docs.microsoft.com/en-us/cpp/build/arm64-windows-abi-conventions?view=msvc-160#stack
[4] https://docs.microsoft.com/en-us/cpp/build/stack-usage?view=msvc-170

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Commit messages:
 - 8262901: [macos_aarch64] NativeCallTest expected:<-3.8194101E18> but was:<3.02668882E10>

Changes: https://git.openjdk.org/jdk/pull/10238/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10238&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8262901
  Stats: 108 lines in 7 files changed: 95 ins; 4 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/10238.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10238/head:pull/10238

PR: https://git.openjdk.org/jdk/pull/10238