Cleanup lifetime guide
Clean pointers guide
get over bold text madness, changes per PR, brought the "returning pointers" section back to pointers guide
fix mostly grammar per PR comments
std: Remove String::from_owned_str as it's redundant

[breaking-change]
Use clang++ for CXX when --enable-clang.

Signed-off-by: OGINO Masanori <masanori.ogino@gmail.com>
std: change select! docs from 'ports' to 'receivers'
fix MIPS target
std: Remove String's to_owned
Fixed deprecation warning text for mem::move_val_init and its associated comment.
std: Rename strbuf operations to string

[breaking-change]
doc: Fix link to string

This was missed in 553074506ecd139eb961fb91eb33ad9fd0183acb
auto merge of #14414 : richo/rust/features/nerf_unused_string_fns, r=alexcrichton

This should block on #14323
auto merge of #14387 : alan-andrade/rust/remove_managed_boxes_and_gc, r=brson

My main goals were:
- be clear when we talk about "references" and "pointers"
- remove Managed boxes completely and the concept of GC.

https://github.com/mozilla/rust/issues/13987
rustdoc: Only link to local inlined foreign items

This commit alters rustdoc to keep a hash set of known inlined items which is a
whitelist for generating URLs to.

Closes #14438
Move std::{reflect,repr,Poly} to a libdebug crate

This commit moves reflection (as well as the {:?} format modifier) to a new
libdebug crate, all of which is marked experimental.

This is a breaking change because it now requires the debug crate to be
explicitly linked if the :? format qualifier is used. This means that any code
using this feature will have to add `extern crate debug;` to the top of the
crate. Any code relying on reflection will also need to do this.

Closes #12019

[breaking-change]
auto merge of #14364 : alexcrichton/rust/libdebug, r=brson

This commit moves reflection (as well as the {:?} format modifier) to a new
libdebug crate, all of which is marked experimental.

This is a breaking change because it now requires the debug crate to be
explicitly linked if the :? format qualifier is used. This means that any code
using this feature will have to add `extern crate debug;` to the top of the
crate. Any code relying on reflection will also need to do this.

Closes #12019

[breaking-change]
auto merge of #14452 : alexcrichton/rust/issue-14438, r=huonw

This commit alters rustdoc to keep a hash set of known inlined items which is a
whitelist for generating URLs to.

Closes #14438
configure: Move clang's libcpp out into flag
configure: Only use -m32 on x86-* 32 bit systems
configure: setup triples on hf arm platforms