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Handle negative cost

Calvin Buckley requested to merge calvinb/kcachegrind:handle-negative-cost into master

xdebug used to emit negative costs, but no longer does. Many versions and oputput files still in the wild that do have negative costs still exist, however, and KCG was often hanging writing to stderr about garbage at the end of the line (the negative cost it couldn't parse as unsigned) when loading files. This checks for those and if so, clamps to zero, speeding up load times.

See: https://github.com/xdebug/xdebug/commit/688c552e620dc5be7eea22cb893c6b71f395c6d4

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