Restore compatibility with LLVM 3.7 and 3.8 #37912
Merged
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#37831 broke compatibility with LLVM 3.7 and 3.8. While LLVM Attribute API has been there for a long time, LLVM Attribute API C binding, including LLVMAttributeRef type, is new in LLVM 3.9. This patch avoids uses of LLVMAttributeRef.
This should fix Travis build.