[aarch64-port-dev ] How to skip the synchronization entry

[Patrick Zhang]

I have a very simple function that directly returns the an input int parameter inside, there are x29, x30 registers being protected before/after "mov w0 w2". I have two questions here:
1. Are these Link Register and Frame Pointer respectively according to the A64 instruction set document?
2. Any special flags to remove them for debugging purpose? I tried -XX:-PreserveFramePoint but no effect.

nop
sub        sp, sp, #0x20
stp         x29, x30, [sp,#16] ;*synchronization entry
mov      w0, w2
ldp        x29, x30, [sp,#16]
add       sp, sp, #0x20
ldr         x8, [x28,#264]
ldr         wzr, [x8] ;   {poll_return}
ret

Regards
Patrick