[llvm-dev] llvm and clang are getting slower

[Rafael Espíndola via llvm-dev]

I have just benchmarked building trunk llvm and clang in Debug,
Release and LTO modes (see the attached scrip for the cmake lines).

The compilers used were clang 3.5, 3.6, 3.7, 3.8 and trunk. In all
cases I used the system libgcc and libstdc++.

For release builds there is a monotonic increase in each version. From
163 minutes with 3.5 to 212 minutes with trunk. For comparison, gcc
5.3.2 takes 205 minutes.

Debug and LTO show an improvement in 3.7, but have regressed again in 3.8.

Cheers,
Rafael
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