[lldb] Remove very old misleading comment (NFC)

GitOrigin-RevId: 4946f37d842fe7bca1b4a30962e7b6acdd7a4a9d
diff --git a/source/Target/ThreadPlanStepThrough.cpp b/source/Target/ThreadPlanStepThrough.cpp
index 06b6269..6fc0312 100644
--- a/source/Target/ThreadPlanStepThrough.cpp
+++ b/source/Target/ThreadPlanStepThrough.cpp
@@ -22,7 +22,6 @@
 // ThreadPlanStepThrough: If the current instruction is a trampoline, step
 // through it If it is the beginning of the prologue of a function, step
 // through that as well.
-// FIXME: At present only handles DYLD trampolines.
 
 ThreadPlanStepThrough::ThreadPlanStepThrough(Thread &thread,
                                              StackID &m_stack_id,