Unmap Fixes

[StevenMiller123]

This PR fixes several memory issues I've noticed.

1. When games try to unmap reserved memory, this would cause address_space asserts on Windows. This is because reserved memory was never mapped in address_space to begin with. My fix is to only unmap in address_space if the unmapped VMA had type != VMAType::Reserved.
2. Some games also attempt to unmap free memory. This causes address_space asserts on Windows, and also messes up later memory use calculations. My solution is adding an early return if the VMA to unmap has type == VMAType::Free.
3. UnmapMemoryImpl doesn't properly handle pooled memory. PoolReserved memory can either be reserved or decommitted memory, either case isn't mapped in address_space. Additionally, Pooled memory is GPU mapped. My solution is adding those relevant checks so we don't run into any strange Windows-specific issues.
4. When games overwrite memory with reserved pages, our check for vma.type == VMAType::Free would fail. This is because, while the UnmapMemoryImpl call modifies vma_map, the vma retrieved before that call is not modified. To fix this, I add an extra FindVMA call after the unmap.

This should fix cases of:

[Debug] <Critical> address_space.cpp:operator():268: Assertion Failed!
Invalid address/size given to unmap.

And some cases of:

[Debug] <Critical> memory.cpp:operator():217: Assertion Failed!

Credits to @red-prig for providing relevant information.

[Missake212]

The Last of Us Remastered goes from crashing on launch to now hanging on a black screen.
shad_log.txt

[StevenMiller123]

@Missake212 Pretty sure TLOU Remastered hangs on main too, this PR shouldn't impact it. Could you test main to verify?

[Missake212]

@Missake212 Pretty sure TLOU Remastered hangs on main too, this PR shouldn't impact it. Could you test main to verify?

TLOU Remastered crashes on main for me, here's the log
shad_log.txt

[StevenMiller123]

Well, an improvement is an improvement, I won't complain about that.

[Inui-senpai]

DDLC+ now crashes on Existing mapping does not contain requested unmap range.
shad_log.txt

[georgemoralis]

let's get dangerous :D