Use the correct parameter environment for simd shuffle arguments

[oli-obk]

r? @eddyb

#52597 (comment)

[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.

[00:17:43]    Compiling build_helper v0.1.0 (file:///checkout/src/build_helper)
[00:17:43]    Compiling rustc_codegen_llvm v0.0.0 (file:///checkout/src/librustc_codegen_llvm)
[00:17:43]    Compiling cc v1.0.18
[00:17:44]    Compiling rustc_llvm v0.0.0 (file:///checkout/src/librustc_llvm)
[00:17:54] error[E0609]: no field `param_env` on type `&mut mir::FunctionCx<'a, 'll, 'tcx>`
[00:17:54]    --> librustc_codegen_llvm/mir/block.rs:527:70
[00:17:54]     |
[00:17:54] 527 |                                     let c = bx.tcx().const_eval(self.param_env.and(cid));
[00:17:54] 
rc/tools/lld
13740 ./obj/build/x86_64-unknown-linux-gnu/stage0-bootstrap-tools/x86_64-unknown-linux-gnu
13736 ./obj/build/x86_64-unknown-linux-gnu/stage0-bootstrap-tools/x86_64-unknown-linux-gnu/release
---
travis_time:end:06d8cce0:start=1533289284626934833,finish=1533289284636001434,duration=9066601
travis_fold:end:after_failure.3
travis_fold:start:after_failure.4
travis_time:start:05179827
$ 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 -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:01a148d3
travis_time:start:01a148d3
$ 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:00ceb33e
$ dmesg | grep -i kill

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