Add support for DW_LNCT_LLVM_source (#728) #488

Job	Run time
bench	1m 9s
coverage	1m 4s
Build fuzz targets	1m 11s
build (ubuntu-latest, stable)	45s
cross (i686-unknown-linux-gnu)	56s
build (ubuntu-latest, beta)	48s
cross (powerpc64-unknown-linux-gnu)	53s
build (ubuntu-latest, nightly)	48s
doc	28s
features	2m 57s
build (stable, macOS-latest)	47s
msrv	1m 50s
msrv-read	1m 44s
rustfmt	7s
Run `debug_abbrev` fuzz target	5m 5s
Run `debug_aranges` fuzz target	5m 6s
Run `debug_info` fuzz target	5m 11s
Run `debug_line` fuzz target	5m 11s
Run `eh_frame` fuzz target	5m 6s
Run `eh_frame_hdr` fuzz target	5m 10s
	46m 16s

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