Correct the end-of-vector check in GetCompactUnwindInfoForFunction().
Problem noticed by Todd Fiala.

llvm-svn: 240060
diff --git a/lldb/source/Symbol/CompactUnwindInfo.cpp b/lldb/source/Symbol/CompactUnwindInfo.cpp
index dac1287..025c138 100644
--- a/lldb/source/Symbol/CompactUnwindInfo.cpp
+++ b/lldb/source/Symbol/CompactUnwindInfo.cpp
@@ -525,7 +525,7 @@
     }
 
     auto next_it = it + 1;
-    if (next_it != m_indexes.begin())
+    if (next_it != m_indexes.end())
     {
         // initialize the function offset end range to be the start of the 
         // next index offset.  If we find an entry which is at the end of