[PATCH] Support arm32 R_ARM_V4BX relocation format

[Rui Ueyama]

LGTM


================
Comment at: tools/yaml2obj/yaml2elf.cpp:362
@@ +361,3 @@
+    // Some special relocation, R_ARM_v4BX for instance, does not have
+    // an external reference.
+    SymN2I.lookup(Rel.Symbol, SymIdx);
----------------
Maybe you want to also add "... So we ignore the return value of lookup() here."

http://reviews.llvm.org/D9162

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