7847f690fd
Add a getter for Frame.loc This is necessary for Priroda. For context see https://rust-lang.zulipchat.com/#narrow/stream/146212-t-compiler.2Fconst-eval/topic/Frame.3A.3Aloc.20no.20longer.20public/near/228070266 and oli-obk/priroda#27. cc `@DJMcNab` r? `@RalfJung`