JIT fixes

- fix fastmem problems on linux
- small fix memory leak
- SlowWrite functions always take in a 32-bit variable so that the C compiler knows that the values aren't necessary zero extended
- a few other stylistic things
- handle SIGBUS as well (for macos)

src/ARMJIT_x64/ARMJIT_Compiler.h

@@ -208,9 +208,9 @@ public:
         SetCodePtr(FarCode);
     }
 
-    bool IsJITFault(u64 addr);
+    bool IsJITFault(u8* addr);
 
-    s32 RewriteMemAccess(u64 pc);
+    u8* RewriteMemAccess(u8* pc);
 
     u8* FarCode;
     u8* NearCode;