kernel/vm: Inline the VMArea::name string.

B_OS_NAME_LENGTH is 32, char* is 8 (on x64), and this structure
has quite a lot of pointers in it so it is not like we really
needed to save those 24 bytes. Hitting malloc() in here is not
so great, especially because we usually have B_DONT_LOCK_KERNEL_SPACE
turned on, so just inline and avoid it.

Change-Id: I5c94955324cfda08972895826b61748c3b69096a

headers/private/kernel/vm/VMArea.h

@@ -97,8 +97,8 @@ public:
 	};
 
 public:
-	char*					name;
 	area_id					id;
+	char					name[B_OS_NAME_LENGTH];
 	uint32					protection;
 	uint16					wiring;