[lldb] Fix typos in file headers

This diff fixes typos in file headers (incorrect file names).

Test plan:

Under llvm/tools/lldb/source:
find ./* -type f | grep -e '\(cpp\|h\)$' | while read F; do B=$(basename $F); echo $F head -n 1 $F | grep -v $B | wc -l ; done

Differential revision: https://reviews.llvm.org/D27115

llvm-svn: 287966
diff --git a/lldb/source/Core/ValueObjectCast.cpp b/lldb/source/Core/ValueObjectCast.cpp
index 5aa2446..300aeae 100644
--- a/lldb/source/Core/ValueObjectCast.cpp
+++ b/lldb/source/Core/ValueObjectCast.cpp
@@ -1,5 +1,4 @@
-//===-- ValueObjectDynamicValue.cpp ---------------------------------*- C++
-//-*-===//
+//===-- ValueObjectCast.cpp -------------------------------------*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //