lit: Issue a note when multiprocessing fails to load

If multiprocessing was requested, detected as available and subsequently failed
to initialize it's worth letting the user know about it before falling back to
threads.

This condition can arise in certain OpenBSD / FreeBSD Python versions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193465 91177308-0d34-0410-b5e6-96231b3b80d8
self.path may be empty or otherwise miss the normal system directories,
so try PATH next. Assume it is sane enough to cover the usual system
bash locations too, but the old list is not good enough for NetBSD.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193471 91177308-0d34-0410-b5e6-96231b3b80d8
lli/RemoteMemoryManager.cpp: Resurrect __main stuff removed in r192504 to unbreak mingw32.

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Revert r193251 : Use address-taken to disambiguate global variable and indirect memops.

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Update link.
PR17608

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Update the Python version. And Perl isn't used anymore.
PR17608

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193491 91177308-0d34-0410-b5e6-96231b3b80d8
Update to specify that both metadata and label types aren't proper return types.

PR15447

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Fix Sphinx warning.

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Update to current output.
PR14039

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A small grammar-os fixed.

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AVX-512: PMIN/PMAX intrinsics and patterns
Patch by Cameron McInally <cameron.mcinally@nyu.edu>


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MCJIT-remote: __main should be resolved in child context.

  - Mark tests as XFAIL:cygming in test/ExecutionEngine/MCJIT/remote.
    Rather to suppress them, I'd like to leave them running as XFAIL.
  - Revert r193472. RecordMemoryManager no longer resolves __main on cygming.

There are a couple of issues.

  - X86 Codegen emits "call __main" in @main for targeting cygming.
    It is useless in JIT. FYI, tests are passing when emitting __main is disabled.
  - Current remote JIT does not resolve any symbols in child context.

FIXME: __main should be disabled, or remote JIT should resolve __main.

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Hexagon: Remove global state.

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NVPTX: Remove unused globals.

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Clarify the comment about BSD versions in r193465

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Make first substantial checkin of my port of ARM constant islands code to Mips.
Before I just ported the shell of the pass. I've tried to keep everything
nearly identical to the ARM version. I think it will be very easy to eventually
merge these two and create a new more general pass that other targets can
use. I have some improvements I would like to make to allow pools to 
be shared across functions and some other things. When I'm all done we
can think about making a more general pass. More to be ported but the
basic mechanism works now almost as good as gcc mips16.



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Target/R600: Un-tab-ify.

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Prune trailing linefeeds.

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Prune utf8 chars in comments.

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