P1208 Adopt source_location from Library Fundamentals V3 for C++20

[jensmaurer]

P1208R1 Adopt source_location from Library Fundamentals V3 for C++20 (Corentin Jabot, Robert Douglas)

https://issues.isocpp.org/show_bug.cgi?id=535

[jensmaurer]

P1208R3 Source-Code Information Capture (Robert Douglas, Corentin Jabot)

[mclow]

History: https://issues.isocpp.org/show_bug.cgi?id=535 and http://wiki.edg.com/bin/view/Wg21sandiego2018/P1208

Conclusion: Revise as directed, bring back in Kona and we will prioritize for C++20. Unanimous consent

[tituswinters]

LEWG in Kona:
Forward to LWG for C++20.
SF F N A SA
7 10 0 0 0

[ Marshall: Fixed link which was wrong ]

[wg21bot]

P1208R4 Adopt source location from Library Fundamentals V3 for C++20 (Robert Douglas, Corentin Jabot)