better logging for filename/function/line on CUDA and CUDNN error; lo…

[stephanecharette]

…gging of full backtrace on Linux when an error causes Darknet to exit

For example, issue #8669 now results in this being logged showing exactly where the error is happening:

 calculation mAP (mean average precision)...
 Detection layer: 30 - type = 28 
 Detection layer: 37 - type = 28 
4CUDA status Error: file: ./src/network_kernels.cu: func: network_predict_gpu() line: 735

 CUDA Error: an illegal memory access was encountered
Darknet error location: ./src/network_kernels.cu, network_predict_gpu(), line #735
CUDA Error: an illegal memory access was encountered: Success
backtrace (11 entries)
1/11: src/darknet-pr/darknet(log_backtrace+0x38) [0x562adf9d1dd8]
2/11: src/darknet-pr/darknet(error+0x3d) [0x562adf9d1ebd]
3/11: src/darknet-pr/darknet(check_error+0xd0) [0x562adf9d4eb0]
4/11: src/darknet-pr/darknet(check_error_extended+0x7c) [0x562adf9d4f9c]
5/11: src/darknet-pr/darknet(network_predict_gpu+0x15f) [0x562adfad509f]
6/11: src/darknet-pr/darknet(validate_detector_map+0x9ad) [0x562adfa64f6d]
7/11: src/darknet-pr/darknet(train_detector+0x16a4) [0x562adfa67ca4]
8/11: src/darknet-pr/darknet(run_detector+0x897) [0x562adfa6bc57]
9/11: src/darknet-pr/darknet(main+0x34d) [0x562adf98663d]
10/11: /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf3) [0x7f433e662083]
11/11: src/darknet-pr/darknet(_start+0x2e) [0x562adf9888be]