Benjamin Kramer 741146b825 Reduce the number of indirections in the attributes implementation. ...

- Coallocate entires for AttributeSetImpls and Nodes after the class itself.
- Remove mutable iterators from immutable classes.
- Remove unused context field from AttributeImpl.
- Derive Enum/Align/String attribute implementations from AttributeImpl instead
  of having a whole new inheritance tree for them.
- Derive AlignAttributeImpl from EnumAttributeImpl.

llvm-svn: 186075

2013-07-11 12:13:16 +00:00

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