Fix PR22000. __bit_iterator::move_backwards. Also make a note that __bit_iterator
is quite underrepresented in the libc++ tests suite.


git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@224723 91177308-0d34-0410-b5e6-96231b3b80d8
[libcxx] Add numerous options to libc++ LIT test suite configuration. 

Summary:
In order to fully replace the testit script we need to update LIT so it provides the same functionality.
This patch adds a number of different configuration options to LIT to do that. It also adds documentation for all of the command line parameters that LIT supports.

Generic options added:
- `libcxx_headers`
- `libcxx_library`
- `compile_flags`


Generic options modified:
- `link_flags`: Changed from overriding the default args to adding extra args instead (to match compile flags)
- `use_sanitizer`: Renamed from `llvm_use_sanitizer`


Please see the added documentation for more information about the switches. As for the actual documentation I'm not sure if it should be kept in libc++ forever since it adds an undue maintenance burden, but I think it should be added for the time being while the changes are new. I'm verify unskilled with HTML so if the documentation needs any changes please let me know.

Hopefully this will kill testit.



Reviewers: jroelofs, mclow.lists, danalbert

Reviewed By: danalbert

Subscribers: alexfh, cfe-commits

Differential Revision: http://reviews.llvm.org/D5877

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@224728 91177308-0d34-0410-b5e6-96231b3b80d8
[libcxx] Consolidate new/delete replacement in tests and disable it when using sanitizers.

Summary:
MSAN and ASAN also replace new/delete which leads to a link error in these tests. Currently they are unsupported but I think it would be useful if these tests could run with sanitizers.

This patch creates a support header that consolidates the new/delete replacement functionality and checking.
When we are using sanitizers new and delete are no longer replaced and the checks always return true.

Reviewers: mclow.lists, danalbert, jroelofs, EricWF

Reviewed By: EricWF

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D6562

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@224741 91177308-0d34-0410-b5e6-96231b3b80d8
Remove non-const test to get test passing. Will come back later and (correctly) add non-const tests

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@224748 91177308-0d34-0410-b5e6-96231b3b80d8
Prevent ill-formed instantiation of __invoke_of<...> during the evaluation of a bind expression. Fixes PR22003.

The SFINAE on the function __mu(Fn, Args...) that evaluates nested bind
expressions always tries to deduce the return type for Fn(Args...) even when Fn
is not a nested bind expression. This can cause hard compile errors when the
instantation of Fn(Args...) is ill-formed. This patch prevents the instantation
of __invoke_of<Fn, Args...> unless Fn is actually a bind expression.

Bug reportand patch from Michel Morin.

http://llvm.org/bugs/show_bug.cgi?id=22003


git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@224753 91177308-0d34-0410-b5e6-96231b3b80d8