Consolidate the include statements scattered across the code in accordance
with the comment in C4Include.h. The advantages are listed in the same
comment.
Furthermore, it follows llvm-include-order which is the logical
extrapolation of the project's style guideline wherever possible
(C4Include.h being the most-frequent exception).
Instead of "Compiler" and "Decompiler", which make me look up what's
even going on each time I see them, use the standard terms "serializer"
and "deserializer".
Tushar Maheshwari