Commits on May 15, 2019

1. Remove the need for #[cfg] in #[use_c_shim_if] …

   This commit tweaks the implementation of the synthetic
   `#[use_c_shim_if]` attribute, renaming it to
   `#[maybe_use_optimized_c_shim]` in the process. This no longer requires
   specifying a `#[cfg]` clause indicating when the optimized intrinsic
   should be used, but rather this is inferred and printed from the build
   script.
   
   The build script will now print out appropriate `#[cfg]` directives for
   rustc to indicate what intrinsics it's compiling. This should remove the
   need for us to keep the build script and the source in sync, but rather
   the build script can simply take care of everything.

   

   alexcrichton committed May 15, 2019
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