1.27.0 beta branch out of sync with rust repo

[ehuss]

The beta branch on the rust repo currently points to 9e53ac6 (on master from May 6th). However the rust-1.27.0 branch on the cargo repo was branched at d19e295 (from the middle of May 5th). The following changes exist on the rust beta branch but not in the rust-1.27.0 cargo branch:

• Cop out on fixing a spurious test failure #5488
• Drop PathSource TODO in GitSource #5489
• Factor in used_in_plugin to target filenames #5490
• Support crate renames in cargo metadata #5461
• Add package spec support to profile overrides. #5491
• Fix random Windows CI error for changing_bin_features_caches_targets #5493

I'm not sure the best way to fix this. Perhaps the rust-1.27.0 branch can be moved to point to 9e53ac6? Or we could manually backport those changes onto the 1.27.0 branch?

For reference, the following two backports are waiting on rust-1.27.0:

• [BETA] Fix cargo rustc for test with implicit binary. #5510
• [beta] Fix mode generated in maybe_lib #5523

cc @alexcrichton

[alexcrichton]

Oh dear I'm not sure how that happened, thanks for the sharp eye though! I've force pushed 9e53ac6 and then manually applied the two backports we've done as well