Numba

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In this release, we are upgrading to LLVM 4.0. We are also starting to
provide wheel packages for 64-bit Linux platforms (manylinux).

Fixes:

* Issue 249, PR 250: Disable static linking of libstdc++ by default.

Enhancements:

* PR 246: Add requirements.txt for pip dependency resolving
* PR 238: LLVM 4.0
* PR 222: Enable wheel builds

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API changes:

* Switched from LLVM 3.8 to 3.9
* ``TargetData.add_pass`` is removed in LLVM 3.9.

Enhancements:

* PR 239: Enable fastmath flags
* PR 233: Updates for llvm3.9.1
* PR 199: Update for changes in LLVM 3.9

Fixes:

* PR 236: Fix metadata with long value
* PR 231: Fix setup.py for Python2.7 so that pip auto installs dependencies
* PR 226: Fix get_host_cpu_features() so that it fails properly

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Enhancements:

* PR 213: Add partial LLVM bindings for ObjectFile.
* PR 215: Add inline assembly helpers in the builder.
* PR 216: Allow specifying alignment in alloca instructions.
* PR 219: Remove unnecessary verify in module linkage.

Fixes:

* PR 209, Issue 208: Fix overly restrictive test for library filenames.

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Enhancements:

* PR 104: Add binding to get and view function control-flow graph.
* PR 210: Improve llvmdev recipe.
* PR 212: Add initializer for the native assembly parser.

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Enhancements:

* PR 176: Switch from LLVM 3.7 to LLVM 3.8.
* PR 191: Allow setting the alignment of a global variable.
* PR 198: Add missing function attributes.
* PR 160: Escape the contents of metadata strings, to allow embedding
any characters.
* PR 162: Add support for creating debug information nodes.
* PR 200: Improve the usability of metadata emission APIs.
* PR 200: Allow calling functions with metadata arguments
(such as ``llvm.dbg.declare``).

Fixes:

* PR 190: Suppress optimization remarks printed out in some cases by LLVM.
* PR 200: Allow attaching metadata to a ``ret`` instruction.

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New release to fix packages on PyPI. Same as v0.12.0.