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fix: Avoid `source-map` module during `signal-exit` handler (#1191)

Prior to this change child processes would call upon the source-map
module to remap coverage during the `signal-exit` handler.  This was a
blocker for updating `source-map` to 0.7.x which uses an async
constructor method.

Now we simply save the source-map with the raw coverage data for each
file.  This allows the main nyc process to perform source-map remapping.
The benefit is that the main nyc process can use async code.

207 of 223 branches covered (92.83%)

461 of 465 relevant lines covered (99.14%)

358.81 hits per line