[PEI] Pass the frame index operand number to the eliminateFrameIndex function.
Each target implementation was needlessly recomputing the index.
Part of rdar://13076458

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174083 91177308-0d34-0410-b5e6-96231b3b80d8
[Dwarf] early exit to avoid creating dangling DIEs

We used to create children DIEs for a scope, then check whether ScopeDIE is
null. If ScopeDIE is null, the children DIEs will be dangling. Other DIEs can
link to those dangling DIEs, which are not emitted at all, causing dwarf error.

The current testing case is 4k lines, from MultiSource/BenchMark/McCat/09-vor.

rdar://problem/13071959


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174084 91177308-0d34-0410-b5e6-96231b3b80d8
When lowering memcpys to loads and stores, make sure we don't promote alignments
past the natural stack alignment.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174085 91177308-0d34-0410-b5e6-96231b3b80d8
Update AArch64 backend to changed eliminateFrameIndex interface.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174086 91177308-0d34-0410-b5e6-96231b3b80d8
[lit] Fix a shell parsing bug with ';' not separated by whitespace.
 - Testing finds bugs, who knew.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174087 91177308-0d34-0410-b5e6-96231b3b80d8
Add braces, so my head doesn't explode.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174088 91177308-0d34-0410-b5e6-96231b3b80d8
[lit] Fix bug where InternalShellError messages were discarded.
 - Also, change the exit code to match 'sh'.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174089 91177308-0d34-0410-b5e6-96231b3b80d8
Add support for emitting a string attribute.

Attributes that are strings are typically target-dependent attributes. They are
of this form in the IR:

   "attr"
   "attr" = "val"


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174090 91177308-0d34-0410-b5e6-96231b3b80d8