[runtime] Use slow path managed allocators when profiling a FullAOT image.

[runtime] Use slow path managed allocators when profiling a FullAOT image.

This is needed because the fast paths in managed allocators (by design) don't
report allocations to the profiler. In regular JIT/AOT mode, managed allocators
are simply disabled to work around this when profiling. However, in FullAOT
mode, an image may have been compiled with managed allocators enabled which
results in the managed allocator actually being emitted into the AOT image.

So, when we want to profile a FullAOT image, we need to replace the regular
managed allocator with one that always goes through the slow path (i.e. calls
straight into the runtime). To that end, when we decode a MONO_WRAPPER_ALLOC
method ref, we redirect it to the appropriate slow path allocator if allocation
profiling is enabled.