[PATCH]: Add a flag to the DWARF Compile Unit to indicate if it was compiled with ARC

[Adrian Prantl]

Hi there,

this is a trivial patch, but it changes the MDNode layout of compile units:

Add a new flag to the compile unit to indicate whether the CU was
compiled with Objective-C Automatic Reference Counting a.k.a. ARC.

rdar://problem/12234671

cheers,
Adrian

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