Fix ARM32 secure delegate bug (#13922)

Fix ARM32 secure delegate bug (#13922)

This change fixes a bug that causes crashes when secure delegate is
invoked on ARM32 with legacy codegen. Register R4 was loaded with
indirection slot address and immediatelly marked as trashed, so the JIT
compiler reused it before the call that was supposed to have that value
in R4.
The fix was to move the reg trashing after the call.
There was also an incorrect marking of that address as EA_PTRSIZE
while it should be EA_BYREF, so I've fixed that too.