[PATCH] [lld] [LinkerScript] Implement semantics for simple sections mappings

[Rui Ueyama]

This patch contains both a linker script expression evaluator and and a user of that feature. Both are rather large, so maybe I'd split it into two patches. Can you do that? The evaluator can be tested using GnuLdDriverTest.cpp.


http://reviews.llvm.org/D7915

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