std: Update backtrace crate dependency

This commit updates the `backtrace` crate from 0.3.34 to 0.3.35. The
[included set of changes][changes] for this update mostly includes some
gimli-related improvements (not relevant for the standard library) but
critically includes a fix for rust-lang/backtrace-rs#230. The standard
library will not aqcuire a session-local lock whenever a backtrace is
generated on Windows to allow external synchronization with the
`backtrace` crate itself, allowing `backtrace` to be safely used while
other threads may be panicking.

[changes]: rust-lang/backtrace-rs@0.3.34...0.3.35

Author: alexcrichton

Cargo.lock

@@ -99,7 +99,7 @@ dependencies = [
 
 [[package]]
 name = "backtrace"
-version = "0.3.34"
+version = "0.3.35"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "backtrace-sys 0.1.30 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -863,7 +863,7 @@ name = "error-chain"
 version = "0.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "backtrace 0.3.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "backtrace 0.3.35 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -878,7 +878,7 @@ name = "failure"
 version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "backtrace 0.3.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "backtrace 0.3.35 (registry+https://github.com/rust-lang/crates.io-index)",
  "failure_derive 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -2577,7 +2577,7 @@ name = "rustc"
 version = "0.0.0"
 dependencies = [
  "arena 0.0.0",
- "backtrace 0.3.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "backtrace 0.3.35 (registry+https://github.com/rust-lang/crates.io-index)",
  "bitflags 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "chalk-engine 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3520,7 +3520,7 @@ name = "std"
 version = "0.0.0"
 dependencies = [
  "alloc 0.0.0",
- "backtrace 0.3.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "backtrace 0.3.35 (registry+https://github.com/rust-lang/crates.io-index)",
  "cc 1.0.35 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "compiler_builtins 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4349,7 +4349,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum arrayref 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "0d382e583f07208808f6b1249e60848879ba3543f57c32277bf52d69c2f0f0ee"
 "checksum arrayvec 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)" = "a1e964f9e24d588183fcb43503abda40d288c8657dfc27311516ce2f05675aef"
 "checksum atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "9a7d5b8723950951411ee34d271d99dddcc2035a16ab25310ea2c8cfd4369652"
-"checksum backtrace 0.3.34 (registry+https://github.com/rust-lang/crates.io-index)" = "b5164d292487f037ece34ec0de2fcede2faa162f085dd96d2385ab81b12765ba"
+"checksum backtrace 0.3.35 (registry+https://github.com/rust-lang/crates.io-index)" = "1371048253fa3bac6704bfd6bbfc922ee9bdcee8881330d40f308b81cc5adc55"
 "checksum backtrace-sys 0.1.30 (registry+https://github.com/rust-lang/crates.io-index)" = "5b3a000b9c543553af61bc01cbfc403b04b5caa9e421033866f2e98061eb3e61"
 "checksum base64 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)" = "0b25d992356d2eb0ed82172f5248873db5560c4721f564b13cb5193bda5e668e"
 "checksum bitflags 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3d155346769a6855b86399e9bc3814ab343cd3d62c7e985113d46a0ec3c281fd"

src/libstd/Cargo.toml

@@ -26,7 +26,7 @@ unwind = { path = "../libunwind" }
 hashbrown = { version = "0.5.0", features = ['rustc-dep-of-std'] }
 
 [dependencies.backtrace]
-version = "0.3.34"
+version = "0.3.35"
 default-features = false # don't use coresymbolication on OSX
 features = [
   "rustc-dep-of-std", # enable build support for integrating into libstd