Attempt to emulate reserved load/store more closely. can't do anything for stores of the same value that are done via a non-reserved store to a reserved location

uses a bitmap that splits up the memory space into 65k blocks per bit.  Currently is using the guest virtual address but should be using physical addresses instead.

Currently if a guest does a reserve on a location and then a reserved store to a totally different location we trigger a breakpoint. This should never happen
Also removed the NEGATED_MUL_blah operations. They weren't necessary, nothing special is needed for the negated result variants.

Added a log message for when watched physical memory has a race, it just would be nice to know when it happens and in what games.

src/xenia/cpu/mmio_handler.cc

@@ -185,7 +185,7 @@ bool MMIOHandler::TryDecodeLoadStore(const uint8_t* p,
   uint8_t rex_b = rex & 0b0001;
   uint8_t rex_x = rex & 0b0010;
   uint8_t rex_r = rex & 0b0100;
-  //uint8_t rex_w = rex & 0b1000;
+  // uint8_t rex_w = rex & 0b1000;
 
   // http://www.sandpile.org/x86/opc_rm.htm
   // http://www.sandpile.org/x86/opc_sib.htm
@@ -448,6 +448,7 @@ bool MMIOHandler::ExceptionCallback(Exception* ex) {
     if (cur_access != memory::PageAccess::kNoAccess &&
         (!is_write || cur_access != memory::PageAccess::kReadOnly)) {
       // Another thread has cleared this watch. Abort.
+      XELOGD("Race condition on watch, was already cleared by another thread!");
       return true;
     }
     // The address is not found within any range, so either a write watch or an