Cranelift ARM64 (AArch64) backend: fix remaining failing tests / correctness holes

[cfallin]

We've merged the initial aarch64 backend now (in #1494), but not all tests pass when executing on an aarch64 system. @alexcrichton is planning to add an aarch64 test run to the CI setup soon, initially adding directives to ignore the failing tests. We need to work through these tests and resolve all failures.

Also important for #1519: some of the failing SpiderMonkey tests likely are due to lingering edge-case correctness issues.

[cfallin]

cc @julian-seward1 @bnjbvr

[github-actions]

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