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brooks
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2016-03-30T21:23:19.492205Z
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Apply upstream llvm r243590

Koop Mast reported that on FreeBSD 10.1-R i386, devel/libclc gets a build
error, when its 'prepare-builtins' segfaults.  It turns out this is due to
a stack overflow, when recursively sorting an internal list.  Upstream,
this was changed to an iterative operation, to prevent stack overflow in
some cases, here:

http://reviews.llvm.org/rL243590
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r243590 | matze | 2015-07-30 01:22:48 +0200 (Thu, 30 Jul 2015) | 9 lines

IR: Implement Value::mergeUseLists() iteratively

This avoids stack overflows when the the compiler does not perform tail
call
elimination. Apparently this happens for MSVC with the /Ob2 switch which
may be used by external code including this header.

Reported by and based on a patch from Jean-Francois Riendeau.

Related to rdar://21900756
------------------------------------------------------------------------

I have verified this allows devel/libclc to build successfully on 10.1-R.

PR:		208403
Submitted by:	dim

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