[PATCH] D12505: [X86] Set MaxVectorAlign for non-Darwin targets as well.

[Ahmed Bougacha via cfe-commits]

ab created this revision.
ab added reviewers: echristo, rnk.
ab added subscribers: alexr, dim, dschuff, tberghammer, cfe-commits.

Follow-up to r246229: this isn't Darwin-specific, so let's enable it for all X86 targets.

Quoting r160209, which introduced it:

```
Currently, if no aligned attribute is specified the alignment of a vector is inferred from its size.  Thus, very large vectors will be over-aligned with no benefit.

```

I tried to cc people for the various OSes we support; if you object or can suggest other reviewers, please do!

http://reviews.llvm.org/D12505

Files:
  lib/Basic/Targets.cpp
  test/CodeGen/const-init.c
  test/CodeGen/vector-alignment.c
  test/CodeGen/x86-vector-alignment.c
  test/CodeGen/x86_64-arguments.c

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