Update stdsimd submodule

[alexcrichton]

Should hopefully bring documentation for wasm intrinsics online!

[rust-highfive]

r? @nikomatsakis

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[rust-highfive]

⚠️ Warning ⚠️

• These commits modify submodules.

[rust-highfive]

The job x86_64-gnu-llvm-5.0 of your PR failed on Travis (raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.

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---
[01:34:16] travis_fold:end:stage0-linkchecker

[01:34:16] travis_time:end:stage0-linkchecker:start=1539119317398368434,finish=1539119319783784010,duration=2385415576

[01:36:26] std/arch/wasm32/index.html:3: broken link - core/arch/wasm32/index.html
3302240 ./obj
3086216 ./obj/build
2450528 ./obj/build/x86_64-unknown-linux-gnu
1069576 ./src
---
travis_time:end:078cb0d9:start=1539119514198033178,finish=1539119514202838573,duration=4805395
travis_fold:end:after_failure.3
travis_fold:start:after_failure.4
travis_time:start:01791c0a
$ ln -s . checkout && for CORE in obj/cores/core.*; do EXE=$(echo $CORE | sed 's|obj/cores/core\.[0-9]*\.!checkout!\(.*\)|\1|;y|!|/|'); if [ -f "$EXE" ]; then printf travis_fold":start:crashlog\n\033[31;1m%s\033[0m\n" "$CORE"; gdb --batch -q -c "$CORE" "$EXE" -iex 'set auto-load off' -iex 'dir src/' -iex 'set sysroot .' -ex bt -ex q; echo travis_fold":"end:crashlog; fi; done || true
travis_fold:end:after_failure.4
travis_fold:start:after_failure.5
travis_time:start:05ca71c0
travis_time:start:05ca71c0
$ cat ./obj/build/x86_64-unknown-linux-gnu/native/asan/build/lib/asan/clang_rt.asan-dynamic-i386.vers || true
cat: ./obj/build/x86_64-unknown-linux-gnu/native/asan/build/lib/asan/clang_rt.asan-dynamic-i386.vers: No such file or directory
travis_fold:end:after_failure.5
travis_fold:start:after_failure.6
travis_time:start:2ad99eb7
$ dmesg | grep -i kill

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

[nikomatsakis]

@bors r+

[bors]

📌 Commit b9b5d6d has been approved by nikomatsakis

[bors]

⌛ Testing commit b9b5d6d with merge 99ab2f4...

[bors]

☀️ Test successful - status-appveyor, status-travis
Approved by: nikomatsakis
Pushing 99ab2f4 to master...