Fix watchpoint check to use watchpoint ranges

[ted]

Summary

Watchpoints, unlike breakpoints, have an address range. This patch changes WatchpointList::FindByAddress() to match on any address in the watchpoint range, instead of only matching on the watchpoint's base address.

source/Breakpoint/WatchpointList.cpp

 WatchpointList::FindByAddress (lldb::addr_t addr) const
 {
     WatchpointSP wp_sp;
     Mutex::Locker locker (m_mutex);
     if (!m_watchpoints.empty())
     {
         wp_collection::const_iterator pos, end = m_watchpoints.end();
         for (pos = m_watchpoints.begin(); pos != end; ++pos)
-            if ((*pos)->GetLoadAddress() == addr) {
+        {
+            lldb::addr_t wp_addr = (*pos)->GetLoadAddress();
+            uint32_t wp_bytesize = (*pos)->GetByteSize();
+            if ((wp_addr <= addr) && ((wp_addr + wp_bytesize) > addr))
+            {
                 wp_sp = *pos;
                 break;
             }
         }
+    }
 
     return wp_sp;
 }
 
 const WatchpointSP
 WatchpointList::FindBySpec (std::string spec) const
 {
     WatchpointSP wp_sp;