Handle methods defined with bad line info

[timholy]

Fixes #439. CC @ablaom.

[codecov]

Codecov Report

Merging #440 into master will decrease coverage by 0.01%.
The diff coverage is 80%.

@@            Coverage Diff             @@
##           master     #440      +/-   ##
==========================================
- Coverage    81.9%   81.88%   -0.02%     
==========================================
  Files          12       12              
  Lines        1547     1551       +4     
==========================================
+ Hits         1267     1270       +3     
- Misses        280      281       +1

Impacted Files	Coverage Δ
src/lowered.jl	88.76% <80%> (-0.32%)	⬇️

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[ablaom]

Any chance of a patch release?

[timholy]

Meant to add another fix and then make a release but my attention turned elsewhere. I'll get this out now. Thanks for the reminder.