[PATCH] Implement semantic action for SEARCH_DIR linker script command

[Ed Maste]

================
Comment at: lib/Driver/GnuLdDriver.cpp:290
@@ -287,1 +289,3 @@
         return ec;
+    if (auto *searchDir = dyn_cast<script::SearchDir>(c))
+        ctx.addSearchPath(searchDir->getSearchPath());
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phabricator often has trouble rendering whitespace properly, but please double-check tabs vs spaces here

http://reviews.llvm.org/D7220

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