Rewrite SVC handler using source generators rather than IL emit (#3371)

* Implement syscall handlers using a source generator

* Copy FlushProcessDataCache implementation to Syscall since it was only implemented on Syscall32

* Fix wrong argument order in some syscalls

* Delete old Reflection.Emit based syscall handling code

* Improvements to the code generation

* ControlCodeMemory address and size is always 64-bit

Ryujinx.Horizon.Generators/CodeGenerator.cs

@@ -0,0 +1,58 @@
+using System.Text;
+
+namespace Ryujinx.Horizon.Generators
+{
+    class CodeGenerator
+    {
+        private const string Indent = "    ";
+        private readonly StringBuilder _sb;
+        private string _currentIndent;
+
+        public CodeGenerator()
+        {
+            _sb = new StringBuilder();
+        }
+
+        public void EnterScope(string header = null)
+        {
+            if (header != null)
+            {
+                AppendLine(header);
+            }
+
+            AppendLine("{");
+            IncreaseIndentation();
+        }
+
+        public void LeaveScope()
+        {
+            DecreaseIndentation();
+            AppendLine("}");
+        }
+
+        public void IncreaseIndentation()
+        {
+            _currentIndent += Indent;
+        }
+
+        public void DecreaseIndentation()
+        {
+            _currentIndent = _currentIndent.Substring(0, _currentIndent.Length - Indent.Length);
+        }
+
+        public void AppendLine()
+        {
+            _sb.AppendLine();
+        }
+
+        public void AppendLine(string text)
+        {
+            _sb.AppendLine(_currentIndent + text);
+        }
+
+        public override string ToString()
+        {
+            return _sb.ToString();
+        }
+    }
+}