Implement support for page sizes > 4KB (#4252)

* Implement support for page sizes > 4KB

* Check and work around more alignment issues

* Was not meant to change this

* Use MemoryBlock.GetPageSize() value for signal handler code

* Do not take the path for private allocations if host supports 4KB pages

* Add Flags attribute on MemoryMapFlags

* Fix dirty region size with 16kb pages

Would accidentally report a size that was too high (generally 16k instead of 4k, uploading 4x as much data)

Co-authored-by: riperiperi <rhy3756547@hotmail.com>

Ryujinx.Tests/Cpu/CpuTest.cs

@@ -53,7 +53,7 @@ namespace Ryujinx.Tests.Cpu
             _ram = new MemoryBlock(Size * 2);
             _memory = new MemoryManager(_ram, 1ul << 16);
             _memory.IncrementReferenceCount();
-            _memory.Map(CodeBaseAddress, 0, Size * 2);
+            _memory.Map(CodeBaseAddress, 0, Size * 2, MemoryMapFlags.Private);
 
             _context = CpuContext.CreateExecutionContext();
             Translator.IsReadyForTranslation.Set();