Add profiler ELT test (#39550)

Add profiler ELT test (#39550)

Fix the following issues:

    On amd64 linux we didn't save and restore the xmm registers, and didn't handle enregistered 16 bytes structs as return values
    On arm we didn't save and restore the floating point registers (I made the linux arm helpers match the windows arm helpers)
    On arm64 we didn't handle 16 byte enregistered structs as return values

And add tests