Implement handling of `library:` keys in thread stop replies.

Summary:
When a windows remote stops because of a DLL load/unload, the debug server
sends a stop reply packet that contains a `library` key with any value (usually
just `library:1`). This indicates to the debugger that a library has been
loaded or unloaded and that the list of libraries should be refreshed (usually
with `qXfer:libraries:read`).

This change just triggers a call to `LoadModules()` which in turns will send a
remote library read command when a stop reply that requests it is received.

Reviewers: clayborg, zturner, tberghammer

Subscribers: lldb-commits

Differential Revision: http://reviews.llvm.org/D12218

llvm-svn: 245708
diff --git a/lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp b/lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp
index 7627f6e..dbbdd2b 100644
--- a/lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp
+++ b/lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp
@@ -2523,6 +2523,10 @@
                     ostr.Printf("%" PRIu64 " %" PRIu32, wp_addr, wp_index);
                     description = ostr.GetString().c_str();
                 }
+                else if (key.compare("library") == 0)
+                {
+                    LoadModules();
+                }
                 else if (key.size() == 2 && ::isxdigit(key[0]) && ::isxdigit(key[1]))
                 {
                     uint32_t reg = StringConvert::ToUInt32 (key.c_str(), UINT32_MAX, 16);