Fix coverage ICEs (unreachable-cov-only, spanview wrong body)#85082

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richkadel wants to merge 3 commits intorust-lang:masterfrom

richkadel:fuchsia-async

Commits on May 8, 2021

Used functions with only unreachable coverage is now possible
richkadel
committed

Commits on May 10, 2021

Spanview needs the relevant body_span used for coverage
richkadel
committed

Commits on May 11, 2021

Simplified body_span and filtered span code
richkadel
committed