message: add IODIMetadata.cpp to makefile.am
  Summary:
  redex-oss-build is failed with following:
  ```
  Sandcastle failed executing step 'Build redex' for command 'lego' with exit code 1.
  ERROR: missing files in Makefile.am
  libredex/IODIMetadata.cpp
  ```
diff: @@ -122,6 +122,7 @@ libredex_la_SOURCES = \
  libredex/ImmutableSubcomponentAnalyzer.cpp \
  libredex/Inliner.cpp \
  libredex/InstructionLowering.cpp \
  + libredex/IODIMetadata.cpp \
  libredex/IRAssembler.cpp \
  libredex/IRCode.cpp \
  libredex/IRInstruction.cpp \
  