[llvm-commits] Add scope support for Absolute symbols

[Sid Manning]

Add support for this cases where absolute symbols binding types.  This 
is the example:

.globl absSymbol
.set absSymbol,0xC0000
.type absSymbol, @object

.local absSymbol2
.set absSymbol2,0xD0000
.type absSymbol2, @object

This patch changes the following:
   * Moves enum Scope from DefinedAtom.h to Atom.h
   * Adds scope method to AbsoluteAtom class
   * Updates YAML to print scope of AbsoluteAtoms
   * Update Native Reader/Writer to handle this new, "attribute"
   * Adds testcase


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