[PATCH] code refactoring on ARMTargetInfo class

[Renato Golin]

================
Comment at: lib/Basic/Targets.cpp:4160
@@ +4159,3 @@
+    if (Triple.getSubArch() == llvm::Triple::SubArchType::NoSubArch)
+      setArchInfo("armv6j");
+    else 
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This seems quite arbitrary... Couldn't you return an empty string?

http://reviews.llvm.org/D10839

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