Rollup merge of #48195 - paoloteti:compiler-builtins-update, r=alexcrichton

Update compiler-builtins to latest master.

- Rebase compiler-rt submodule to LLVM 6
- New VFP intrinsics on ARM
- Add generic conversion from a narrower to a wider FP type (f32 to f64)
- Fixes minor issues on _subsf3, __subdf3 and __aeabi_fcmple
- Split test suite to a separate crate
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kennytm 2018-02-14 16:14:50 +08:00
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Subproject commit 345447948f7a51eca970fa036cefd613d54a4f79
Subproject commit 266ea0740a5bdd262a38bbd88fb55fc3d2a7a96e