[PATCH] LinkerScript: Add parsing of the MEMORY command

[Meador Inge]

This patch implements parsing of the GNU ld MEMORY command [1].
The command and the memory block definitions are parsed as
specified (including the slightly strange "o" and "l" keywords).
Evaluation will be added at a later point in time.

[1] https://sourceware.org/binutils/docs-2.25/ld/MEMORY.html

http://reviews.llvm.org/D8212

Files:
  include/lld/ReaderWriter/LinkerScript.h
  lib/ReaderWriter/LinkerScript.cpp
  test/LinkerScript/memory-empty.test
  test/LinkerScript/memory-missing-attrs.test
  test/LinkerScript/memory-missing-length.test
  test/LinkerScript/memory-missing-name.test
  test/LinkerScript/memory-missing-origin.test
  test/LinkerScript/memory-valid.test

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