Use `tracing` spans to trace the entire MIR interp stack#75143

Merged

bors merged 2 commits intorust-lang:masterfrom

oli-obk:tracing

Oct 4, 2020

Commits on Sep 28, 2020

Use `tracing` spans to trace the entire MIR interp stack
oli-obk
committed

Commits on Oct 1, 2020

Only mention that a stack frame is being popped when starting to do so
oli-obk
committed