This rebase skips the following patches in upstream:
+ 37025e1b32
Make the helper routines in string really be constexpr. This required a
bit of refacoring in algorithm as well. Give them better names while
we're at it. All of these are internal rotines; no visible functionality
change.
+ 164b297099
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)
+ e4694b4129
Formatting improvements in the <string_view> synopsis suggested by
RSmith. No functionality change.
+ 3a61b30f3a
Minor cleanup for string_view; mostly from suggestions by Richard Smith.
Also, make the tests pass under c++03
+ 484728789e
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.
+ b1a40264dc
[libcxx] Add <experimental/utility> header for LFTS.
+ 3ee7233c80
[libcxx] expose experimental::erased_type for all standard versions.
+ 67740670f9
NFC. Remove trailing whitespace and tabs.
+ b9536101dc
NFC. Move definition of _LIBCPP_ASSERT into __debug header and remove
external include guards.
+ 98c4e404ca.
Revert "Turn off extern templates for most uses."
Bug: 17255369
Change-Id: I629ff16275d50e4cc8767b253a2c0542468348d8
