RFR: 8286058: AArch64: clarify uses of MacroAssembler::trampoline_call

[Evgeny Astigeevich]

On Thu, 5 May 2022 20:36:17 GMT, Evgeny Astigeevich <duke at openjdk.java.net> wrote:

> `MacroAssembler::trampoline_call` is for generating calls of targets which are inside CodeCache and can have relocInfo types: `runtime_call_type`, `opt_virtual_call_type`, `static_call_type` or `virtual_call_type`.
> This PR updates the description of the function and adds additional asserts.
> Tested a fastdebug build:
> - `gtest`: Passed
> - `tier1`: Passed

@vnkozlov, @theRealAph
Could you please review?

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PR: https://git.openjdk.java.net/jdk/pull/8564