The patch is to improve the memory footprint of pass GlobalOpt. 
Also check in a case to repeat the issue, on which 'opt -globalopt' consumes 1.6GB memory.
The big memory footprint cause is that current GlobalOpt one by one hoists and stores the leaf element constant into the global array, in each iteration, it recreates the global array initializer constant and leave the old initializer alone. This may result in many obsolete constants left.
For example:  we have global array @rom = global [16 x i32] zeroinitializer
After the first element value is hoisted and installed:   @rom = global [16 x i32] [ 1, 0, 0, ... ]
After the second element value is installed:  @rom = global [16 x 32] [ 1, 2, 0, 0, ... ]        // here the previous initializer is obsolete
...
When the transform is done, we have 15 obsolete initializers left useless.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169079 91177308-0d34-0410-b5e6-96231b3b80d8
Revert previous check in r168581, r169079 as they are still in code review status.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169083 91177308-0d34-0410-b5e6-96231b3b80d8
SROA: Avoid struct and array types early to avoid creating an overly large integer type.

Fixes PR14465.

Differential Revision: http://llvm-reviews.chandlerc.com/D148

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169084 91177308-0d34-0410-b5e6-96231b3b80d8
Add .arcconfig to the repository. Useful if someone wants to use phabricator's command line tool.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169085 91177308-0d34-0410-b5e6-96231b3b80d8
Documentation: convert WritingAnLLVMBackend.html to reST


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169087 91177308-0d34-0410-b5e6-96231b3b80d8
Remove bugzilla link.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169091 91177308-0d34-0410-b5e6-96231b3b80d8
Support referencing variables defined on the same line.

See http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20121126/157198.html
and related discussions.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169101 91177308-0d34-0410-b5e6-96231b3b80d8
[python] Add markup option to disassembler

Patch contributed by Wladimir J. van der Laan <laanwj@gmail.com>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169102 91177308-0d34-0410-b5e6-96231b3b80d8
Update FileCheck's documentation to mention recently added feature of
matching a variable defined on the same line.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169103 91177308-0d34-0410-b5e6-96231b3b80d8
Attempt to fix Makefile.sphinx to not generate errors while trying to copy
files from tutorial/.svn


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169104 91177308-0d34-0410-b5e6-96231b3b80d8
Another fix attempt to Makefile.sphinx - copy the PNGs from tutorial/ as well,
and recursive copying is not required for the tutorial/ directory.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169105 91177308-0d34-0410-b5e6-96231b3b80d8
Unbreak Sphinx build

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169106 91177308-0d34-0410-b5e6-96231b3b80d8
Simplify the coding standards for #include ordering. The ordering is now
trivially achievable with an editor. I'll likely check in a silly python
script to help with this too.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169107 91177308-0d34-0410-b5e6-96231b3b80d8
Fix an invalid regex in the test


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169108 91177308-0d34-0410-b5e6-96231b3b80d8
Fix a bug in FileCheck that wouldn't let define variables as follows:

; CHECK: [[VAR:[a-z]]]

The problem was that to find the end of the regex var definition, it was
simplistically looking for the next ]] and finding the incorrect one. A
better approach is to count nesting of brackets (taking escaping into
account). This way the brackets that are part of the regex can be discovered
and skipped properly, and the ]] ending is detected in the right place.




git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169109 91177308-0d34-0410-b5e6-96231b3b80d8
Bring vim keyword lists up to date.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169110 91177308-0d34-0410-b5e6-96231b3b80d8
Allow merging multiple store sequences on the same chain.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169111 91177308-0d34-0410-b5e6-96231b3b80d8
Clean up, bring up-to-date and apply consistent formatting.

This document is a long-time pet peeve :-) More fixes to come.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169115 91177308-0d34-0410-b5e6-96231b3b80d8
Remove 'deplibs' keyword, since it's no longer used.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169116 91177308-0d34-0410-b5e6-96231b3b80d8
Define signed const-ext predicates.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169117 91177308-0d34-0410-b5e6-96231b3b80d8