[x64] Fix up unwind info for emitted functions.

- [x64] Track size of code within emitted functions (prolog, body, epilog).
- [x64] Don't use hardcoded prolog size in generated unwind info.
- [x64] Update URLs to MSDN documentation on UNWIND_INFO/UNWIND_CODE.

src/xenia/cpu/backend/x64/x64_code_cache.h

@@ -25,6 +25,17 @@ namespace cpu {
 namespace backend {
 namespace x64 {
 
+struct EmitFunctionInfo {
+  struct _code_size {
+    size_t prolog;
+    size_t body;
+    size_t epilog;
+    size_t tail;
+    size_t total;
+  } code_size;
+  size_t stack_size;
+};
+
 class X64CodeCache : public CodeCache {
  public:
   ~X64CodeCache() override;
@@ -48,9 +59,9 @@ class X64CodeCache : public CodeCache {
   void CommitExecutableRange(uint32_t guest_low, uint32_t guest_high);
 
   void* PlaceHostCode(uint32_t guest_address, void* machine_code,
-                      size_t code_size, size_t stack_size);
+                      const EmitFunctionInfo& func_info);
   void* PlaceGuestCode(uint32_t guest_address, void* machine_code,
-                       size_t code_size, size_t stack_size,
+                       const EmitFunctionInfo& func_info,
                        GuestFunction* function_info);
   uint32_t PlaceData(const void* data, size_t length);
 
@@ -84,8 +95,7 @@ class X64CodeCache : public CodeCache {
     return UnwindReservation();
   }
   virtual void PlaceCode(uint32_t guest_address, void* machine_code,
-                         size_t code_size, size_t stack_size,
-                         void* code_address,
+                         const EmitFunctionInfo& func_info, void* code_address,
                          UnwindReservation unwind_reservation) {}
 
   std::wstring file_name_;