Implement string_view from the library fundamentals TS (n4023). Also works in C++11 and 03, with reduced functionality (mostly in the area of constexpr)

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@210659 91177308-0d34-0410-b5e6-96231b3b80d8
Revert "fixes duplicate header installation"

This reverts commit 0bd40d6c3da6719fecf77038673d453ff1eab25b.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@210857 91177308-0d34-0410-b5e6-96231b3b80d8
Formatting improvements in the <string_view> synopsis suggested by RSmith. No functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@211191 91177308-0d34-0410-b5e6-96231b3b80d8
Some calls to get<>() were qualified. Some were not. Qualify them all. Fixes bug #20092. Thanks to Agustín Bergé for the bug report and the fix.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@211563 91177308-0d34-0410-b5e6-96231b3b80d8
eliminate install of duplicate headers (take 2)
Patch by Ryuta Suzuki

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@211629 91177308-0d34-0410-b5e6-96231b3b80d8
Patch from Albert J. Wong to make type_traits take advantage of gcc intrinsics in 4.7 and later. No functionality change when using clang.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@211755 91177308-0d34-0410-b5e6-96231b3b80d8
Add checking for the complexity guarantees in the standard

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@212017 91177308-0d34-0410-b5e6-96231b3b80d8
Fix a typo in the noexcept calculation for __compressed_pair::swap. Thanks to EricWF for the bug report and the fix.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@212046 91177308-0d34-0410-b5e6-96231b3b80d8
Fix libc++ bug #20039: 'Constructing std::function from empty compatible std::function results in half-empty state' Thanks to Agustin Berge for the report, and for his and Eric Fiselier's work on a fix.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@212070 91177308-0d34-0410-b5e6-96231b3b80d8
Minor cleanup for string_view; mostly from suggestions by Richard Smith. Also, make the tests pass under c++03

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@212185 91177308-0d34-0410-b5e6-96231b3b80d8
Fix some failing tests for the standard containers. The tests were failing in 32-bit mode because they assumed that std::size_type and make_unsigned<ptrdiff_t>::type were always the same type. No change to libc++, just the tests.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@212538 91177308-0d34-0410-b5e6-96231b3b80d8
string_view enhancements. Move to the correct namespace. Better constexpr support (thanks to Richard for the suggestions). Update the tests to match this. Add <experimental/__config for experimental macros/etc to live.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@212569 91177308-0d34-0410-b5e6-96231b3b80d8
Add a reset method to the counting predicates in the test suite

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@212651 91177308-0d34-0410-b5e6-96231b3b80d8
Fix warning in test - missing exception specifier for overload of operator new

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@212723 91177308-0d34-0410-b5e6-96231b3b80d8
Add support for BIONIC C library (Android). Patch from Dan Albert

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@212724 91177308-0d34-0410-b5e6-96231b3b80d8
Support the built-in type-trait support in gcc 4.7 and later. Thanks to Albert Wong for the patch.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@212727 91177308-0d34-0410-b5e6-96231b3b80d8
Change Windows decoration on some base classes

Mark the base classes for time_get_byname and time_get as _LIBCPP_TYPE_VIS_ONLY
rather than _LIBCPP_TYPE_VIS.  These base classes are templated types and cannot
be stored with export dll storage.

Fixes compilation with _LIBCPP_DLL for Windows when the time_get and
time_get_byname classes are used.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@213116 91177308-0d34-0410-b5e6-96231b3b80d8
Correctly implement LWG 2049; std::is_destructible.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@213163 91177308-0d34-0410-b5e6-96231b3b80d8