Cleanup kills source a little

Summary: Seems like it's a little bit rotted. Also removes the kills source
flag from a couple ToInt conversions which seemed suspect.

Reviewed By: @swtaarrs

Differential Revision: D1746891

Signature: t1:1746891:1418899014:2d4c8c1584483174eeaeb6c06916e580ec053167
Remove dependence of coverage on ParserHeap.

Reviewed By: @paroski

Differential Revision: D1745250

Signature: t1:1745250:1418953024:06d1c98f8284542d3c92abb08471844de08d0a73