sanitise sign comparisons

This is a mechanical change addressing the various sign comparison warnings that
are identified by both clang and gcc.  This helps cleanup some of the warning
spew that occurs during builds.

llvm-svn: 205390
diff --git a/lldb/source/Target/Thread.cpp b/lldb/source/Target/Thread.cpp
index 1d7da98..0f82617 100644
--- a/lldb/source/Target/Thread.cpp
+++ b/lldb/source/Target/Thread.cpp
@@ -2121,7 +2121,8 @@
             {
                 lldb::addr_t pc = reg_ctx_sp->GetPC();
                 BreakpointSiteSP bp_site_sp = GetProcess()->GetBreakpointSiteList().FindByAddress(pc);
-                if (bp_site_sp && value == bp_site_sp->GetID())
+                if (bp_site_sp &&
+                    static_cast<break_id_t>(value) == bp_site_sp->GetID())
                     return true;
             }
         }