Auto merge of #3170 - alexcrichton:ignore-rustc-macro, r=alexcrichton
Auto merge of #3170 - alexcrichton:ignore-rustc-macro, r=alexcrichton

Ignore rustc-macro tests for now

We need to ignore them to land rust-lang/rust#36945 and after that we'll shortly
re-enable them.

sbeckeriv/cargo,tshepang/cargo,nipunn1313/cargo,eminence/cargo,AndiDog/cargo,rustyhorde/cargo,durka/cargo,rustyhorde/cargo,achanda/cargo,tshepang/cargo,tsurai/cargo,vojtechkral/cargo,rust-lang/cargo,AndiDog/cargo,nipunn1313/cargo,nipunn1313/cargo,AndiDog/cargo,achanda/cargo,durka/cargo,rust-lang/cargo,eminence/cargo,AndiDog/cargo,nipunn1313/cargo,tsurai/cargo,sbeckeriv/cargo,durka/cargo,vojtechkral/cargo,vojtechkral/cargo,eminence/cargo,rustyhorde/cargo,sbeckeriv/cargo,rust-lang/cargo,durka/cargo,eminence/cargo,rustyhorde/cargo,tshepang/cargo,tshepang/cargo,rust-lang/cargo,tsurai/cargo,achanda/cargo,tsurai/cargo,sbeckeriv/cargo,tsurai/cargo,achanda/cargo,AndiDog/cargo,vojtechkral/cargo