Turns out we needed to exclude a number of math functions on the
`wasm32-unknown-wasi` target, and this was fixed in 0.1.9 of
compiler-builtins and this is pulling in the fix to libstd's own build.

LLVM 9 is adding support for a "pic" relocation model for wasm code,
which is quite different than the current model. In order to preserve
the mode of compilation that we have today default to "static" to ensure
that we don't accidentally start creating experimental relocatable
binaries.

…mertj

Unsized rvalues: implement boxed closure impls. (2nd try)

This is a rebase of S-blocked-closed PR rust-lang#55431 to current master. LLVM has moved forward since then, so maybe we can check whether the new LLVM 8.0 version unblocked this work.

std: Upgrade `compiler_builtins` to fix wasi linkage

Turns out we needed to exclude a number of math functions on the
`wasm32-unknown-wasi` target, and this was fixed in 0.1.9 of
compiler-builtins and this is pulling in the fix to libstd's own build.

Update cargo

20 commits in
63231f438a2b5b84ccf319a5de22343ee0316323..6f3e9c367abb497c64f360c3839dab5e74928d5c
2019-03-27 12:26:45 +0000 to 2019-04-04 14:11:33 +0000
- Fix Init for Fossil SCM project (rust-lang/cargo#6792)
- Fix member_manifest_version_error accessing the network (rust-lang/cargo#6799)
- Don't include email if it is empty (rust-lang/cargo#6802)
- Fix unused import warning (rust-lang/cargo#6807)
- Add some help and documentation for unstable flags (rust-lang/cargo#6791)
- Allow `cargo doc --open` with multiple packages (rust-lang/cargo#6803)
- Allow `cargo install --path P` to load config from P (rust-lang/cargo#6804)
- Add more suggestions on how to deal with excluding a package from a workspace (rust-lang/cargo#6805)
- Warn on version req with metadata (rust-lang/cargo#6806)
- cargo install: Be more restrictive about cli flags (rust-lang/cargo#6801)
- Support force-pushed repos with git-fetch-with-cli (rust-lang/cargo#6800)
- Cargo clippy (rust-lang/cargo#6759)
- Don't include metadata in wasm binary examples (rust-lang/cargo#6812)
- Update glossary for `feature` (rust-lang/cargo#6809)
- Include proc-macros in `build-override` (rust-lang/cargo#6811)
- Resolver: A dep is equivalent to one of the things it can resolve to (rust-lang/cargo#6776)
- Add some docs for `Downloads` (rust-lang/cargo#6815)
- Resolve: Be less strict while offline (rust-lang/cargo#6814)
- Accept trailing comma in test of impl Debug for PackageId (rust-lang/cargo#6818)
- Fix doc link (rust-lang/cargo#6820)

<br>

I specifically care about "Accept trailing comma in test of impl Debug for PackageId (rust-lang/cargo#6818)" to unblock rust-lang#59076.

Mentioning @ehuss.

Mark unix::ffi::OsStrExt methods as inline

This is a small change, but I found it surprising it's not inlined looking at the assembly.

Use declare_lint_pass! and impl_lint_pass! in more places

Fixes rust-lang#59683

…=eddyb

wasm32: Default to a "static" relocation model

LLVM 9 is adding support for a "pic" relocation model for wasm code,
which is quite different than the current model. In order to preserve
the mode of compilation that we have today default to "static" to ensure
that we don't accidentally start creating experimental relocatable
binaries.