[lldb] Replace empty ctor en dtor bodies with =default (NFC)

Use = default instead of empty constructor and destructor bodies in the
API layer.
diff --git a/lldb/source/API/SBBreakpointLocation.cpp b/lldb/source/API/SBBreakpointLocation.cpp
index 40384c7..e29f3fd 100644
--- a/lldb/source/API/SBBreakpointLocation.cpp
+++ b/lldb/source/API/SBBreakpointLocation.cpp
@@ -59,7 +59,7 @@
   return LLDB_RECORD_RESULT(*this);
 }
 
-SBBreakpointLocation::~SBBreakpointLocation() {}
+SBBreakpointLocation::~SBBreakpointLocation() = default;
 
 BreakpointLocationSP SBBreakpointLocation::GetSP() const {
   return m_opaque_wp.lock();