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Rewrite line number computation in WSL #881

Job	Run time
Test Build	27s
Test Browser on macOS (safari, disabled)	1m 9s
Test Browser on Linux (firefox, default)	1m 24s
Test Browser on macOS (safari, main)	56s
Test Browser on Linux (chrome, disabled)	53s
Test Browser on Linux (chrome, default)	1m 9s
Test Browser on macOS (safari, default)	2m 9s
Test Browser on Linux (firefox, disabled)	58s
Test Browser on Linux (chrome, main)	35s
Test Browser on Linux (firefox, main)	52s
Test Shell (spidermonkey, main)	24s
Test Shell (jsc, main)	30s
Test Shell (spidermonkey, default)	23s
Test Shell (v8, default)	23s
Test Shell (jsc, default)	32s
Test Shell (spidermonkey, disabled)	26s
Test Shell (v8, disabled)	24s
Test Shell (jsc, disabled)	27s
Test Shell (v8, main)	24s
	14m 25s