passes: updates for LLVM 3.6.1

This patch also takes the first step to remove backward compatibility
code from the passes. We only support the in-tree LLVM version.

Change-Id: I7836e524404afba151d

passes: updates for LLVM 3.6.1

This patch also takes the first step to remove backward compatibility
code from the passes. We only support the in-tree LLVM version.

Change-Id: I7836e524404afba151d1a8bfa539b505e1dbdb8e

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ASR pass: disable caller padding by default

The feature is fundamentally broken. See the comment in the code.

Change-Id: If36b06b0732cc4d18f20240ed96d30a7959b0d21

Import ASR pass from llvm-apps

Change-Id: I106c5faf8d8f1af5d3f5542fe666532895413909