Changes

[docs] Remove training whitespaces. NFC
Subscribers: jfb, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D67835
llvm-svn: 372399

[ELF] Error if the linked-to section of a SHF_LINK_ORDER section is
discarded
Summary: If st_link(A)=B, and A has the SHF_LINK_ORDER flag, we may
dereference a null pointer if B is garbage collected (PR43147):
1. In Wrter.cpp:compareByFilePosition, `aOut->sectionIndex` or
`bOut->sectionIndex` 2. In OutputSections::finalize,
`d->getParent()->sectionIndex`
Simply error and bail out to avoid null pointer dereferences. ld.bfd has 
a similar error:
    sh_link of section `.bar' points to discarded section `.foo0' of
`a.o'
ld.bfd is more permissive in that it just checks whether the linked-to 
section of the first input section is discarded. This is likely because 
it sets sh_link of the output section according to the first input 
section.
Reviewed By: grimar
Differential Revision: https://reviews.llvm.org/D67761
llvm-svn: 372400

[ARM] Fix CTTZ not generating correct instructions MVE
CTTZ intrinsic should have been set to Custom, not Expand
llvm-svn: 372401

[InstCombine] Tests for (a+b)<=a && (a+b)!=0 fold (PR43259)
https://rise4fun.com/Alive/knp https://rise4fun.com/Alive/ALap
llvm-svn: 372402

[MVT] Add v256i1 to MachineValueType
This type can show up when lowering some HVX vector code on Hexagon.
llvm-svn: 372403

Remove assert from MachineLoop::getLoopPredecessor()
According to the documentation method returns predecessor if the given
loop's header has exactly one unique predecessor outside the loop.
Otherwise return null.
In reality it asserts if there is no predecessor outside of the loop.
The testcase has the loop where predecessors outside of the loop were
not identified as analyzeBranch() was unable to process the mask branch
and returned true. That is also not correct to assert for the truly dead
loops.
Differential Revision: https://reviews.llvm.org/D67634
llvm-svn: 372405

Unwind: prevent unw_get_proc_info from returning stale data
If unwind info is not available at the current IP, unw_get_proc_info
should return a zero-filled structure rather than the info of the
previous IP.
This change also makes unw_get_proc_info return UNW_ENOINFO instead of 
UNW_ESUCCESS.
Patch by Amanieu d'Antras!
llvm-svn: 372407

[aarch64] add def-pats for dot product
This patch adds the patterns to select the dot product instructions. 
Tested on aarch64-linux with make check-all.
Differential Revision: https://reviews.llvm.org/D67645
llvm-svn: 372408