[AVX512] Fix miscompile for unpack

r189189 implemented AVX512 unpack by essentially performing a 256-bit unpack
between the low and the high 256 bits of src1 into the low part of the
destination and another unpack of the low and high 256 bits of src2 into the
high part of the destination.

I don't think that's how unpack works.  AVX512 unpack simply has more 128-bit
lanes but other than it works the same way as AVX.  So in each 128-bit lane,
we're always interleaving certain parts of both operands rather different
parts of one of the operands.

E.g. for this:
__v16sf a = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };
__v16sf b = { 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31 };
__v16sf c = __builtin_shufflevector(a, b, 0, 8, 1, 9, 4, 12, 5, 13, 16,
	    			       	     24, 17, 25, 20, 28, 21, 29);

we generated punpcklps (notice how the elements of a and b are not interleaved
in the shuffle).  In turn, c was set to this:

  0 16 1 17 4 20 5 21 8 24 9 25 12 28 13 29

Obviously this should have just returned the mask vector of the shuffle
vector.

I mostly reverted this change and made sure the original AVX code worked
for 512-bit vectors as well.

Also updated the tests because they matched the logic from the code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217602 91177308-0d34-0410-b5e6-96231b3b80d8
Added missing LLVM_NOEXCEPT to the definition of _obj2yaml_error_category::name

LLVM_NOEXCEPT was added in r210591.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217603 91177308-0d34-0410-b5e6-96231b3b80d8
[MCJIT] Take the relocation addend into account when applying ARM MachO VANILLA
and BR24 relocations.

<rdar://problem/18296496>



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217605 91177308-0d34-0410-b5e6-96231b3b80d8
Add DAG combine for shl + add of constants.

Do
 (shl (add x, c1), c2) -> (add (shl x, c2), c1 << c2)

This is already done for multiplies, but since multiplies
by powers of two are turned into shifts, we also need
to handle it here.

This might want checks for isLegalAddImmediate to avoid
transforming an add of a legal immediate with one that isn't.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217610 91177308-0d34-0410-b5e6-96231b3b80d8
Provide an implementation of getNoopForMachoTarget for SPARC.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217611 91177308-0d34-0410-b5e6-96231b3b80d8
Add triple to test to fix bots

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217612 91177308-0d34-0410-b5e6-96231b3b80d8