NFC: Move Searcher::Depth into lldb-enumerations as SearchDepth.

In a subsequent commit, I will need to expose the search depth
to the SB API's, so I'm moving this define into lldb-enumerations
where it will get added to the lldb module.

llvm-svn: 341690
diff --git a/lldb/source/Target/LanguageRuntime.cpp b/lldb/source/Target/LanguageRuntime.cpp
index bd02121..22ad2d2 100644
--- a/lldb/source/Target/LanguageRuntime.cpp
+++ b/lldb/source/Target/LanguageRuntime.cpp
@@ -125,11 +125,11 @@
       return eCallbackReturnStop;
   }
 
-  Searcher::Depth GetDepth() override {
+  lldb::SearchDepth GetDepth() override {
     if (SetActualResolver())
       return m_actual_resolver_sp->GetDepth();
     else
-      return eDepthTarget;
+      return lldb::eSearchDepthTarget;
   }
 
   void GetDescription(Stream *s) override {