PR16726: extend rol/ror matching

C-like languages promote types like unsigned short to unsigned int before
performing an arithmetic operation. Currently the rotate matcher in the
DAGCombiner does not consider this situation.

This commit extends the DAGCombiner in the way that the pattern

(or (shl ([az]ext x), (*ext y)), (srl ([az]ext x), (*ext (sub 32, y))))

is folded into

([az]ext (rotl x, y))

The matching is restricted to aext and zext because in this cases the upper
bits are either undefined or known. Test case is included.

This fixes PR16726.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191049 91177308-0d34-0410-b5e6-96231b3b80d8
DebugInfo: llvm-dwarfdump support for gnu_pubnames section

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191050 91177308-0d34-0410-b5e6-96231b3b80d8
Rename ConvergingScheduler to GenericScheduler.

This was an experimental scheduler a year ago. It's now used by
several subtargets, both in-order and out-of-order, and it
is about to be enabled by default for x86 and armv7. It will be the
new GenericScheduler for subtargets that don't provide their own
SchedulingStrategy.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191051 91177308-0d34-0410-b5e6-96231b3b80d8
Added support for generate DWARF .debug_aranges sections automatically.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191052 91177308-0d34-0410-b5e6-96231b3b80d8
Fixed warning

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191053 91177308-0d34-0410-b5e6-96231b3b80d8
DebugInfo: constrain gnu pubnames test further

Ensures that the pubnames entries actually refer to the intended
entities. This test could be more flexible if there was a way to do
multiline FileCheck matches with captures (in that way the test wouldn't
need to have hardcoded offset values and would thus be resilient to
changes in the layout of the DIEs in this CU).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191055 91177308-0d34-0410-b5e6-96231b3b80d8