revert: restore state before huge regression

tests/SharpEmu.Libs.Tests/FakeCpuMemory.cs

@@ -7,18 +7,15 @@ namespace SharpEmu.Libs.Tests;
 
 // A single contiguous guest region backed by a byte[]. Enough to hand C strings and small
 // structures to HLE exports under test without a live guest.
-internal sealed class FakeCpuMemory : ICpuMemory, IGuestMemoryAllocator
+internal sealed class FakeCpuMemory : ICpuMemory
 {
     private readonly ulong _base;
     private readonly byte[] _storage;
-    private ulong _allocBump;
 
     public FakeCpuMemory(ulong baseAddress, int size)
     {
         _base = baseAddress;
         _storage = new byte[size];
-        // Bump from the top so test fixtures at low offsets stay intact.
-        _allocBump = baseAddress + (ulong)size;
     }
 
     public bool TryRead(ulong virtualAddress, Span<byte> destination)
@@ -43,33 +40,6 @@ internal sealed class FakeCpuMemory : ICpuMemory, IGuestMemoryAllocator
         return true;
     }
 
-    public bool TryAllocateGuestMemory(ulong size, ulong alignment, out ulong address)
-    {
-        address = 0;
-        if (size == 0 || alignment == 0 || (alignment & (alignment - 1)) != 0)
-        {
-            return false;
-        }
-
-        var alignedSize = (size + alignment - 1) & ~(alignment - 1);
-        if (alignedSize > _allocBump - _base)
-        {
-            return false;
-        }
-
-        var next = (_allocBump - alignedSize) & ~(alignment - 1);
-        if (next < _base)
-        {
-            return false;
-        }
-
-        _allocBump = next;
-        address = next;
-        return true;
-    }
-
-    public bool TryFreeGuestMemory(ulong address) => false;
-
     public ulong WriteCString(ulong virtualAddress, string text)
     {
         var bytes = System.Text.Encoding.UTF8.GetBytes(text);