[PATCH] COFFObjectFile imports fix for compressed binaries

[Bandzi Michal via llvm-commits]

COFFObjectFile import iterators do not work for some compressed binaries.
Before loading, binary contains two identical structures containing
imports: Look-up Table and Address Table. LLVM uses only Look-up
table which is often stripped by packers due to its redundancy.

Proposed solution in patch (attachment) adds Address Table as
fall-back option to read imports in case Look-up Table does not exist.
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