Add stack trace to ql::exception message

QuTech-Delft / OpenQL

OpenQL: A Portable Quantum Programming Framework for Quantum Accelerators. https://dl.acm.org/doi/10.1145/3474222

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Given platform support (backward supports a bunch of backends) ql::exception now does a stack trace upon construction and appends it to its exception message. It's probably not great in terms of performance, so if it slows things down it should probably be made optional at some point, but for now it should aid debugging.

Example:

terminate called after throwing an instance of 'ql::exception'
  what():  hello this is a test
Stack trace (most recent call last):
#8    Object "", at 0xffffffffffffffff, in 
#7    Source "../sysdeps/x86_64/start.S", line 120, in _start
#6    Object "/lib64/libc-2.26.so", at 0x2afec7550349, in __libc_start_main
#5    Source "/data/quantum/openql-work/develop/tests/test_mapper.cc", line 1434, in main
#4    Source "/data/quantum/openql-work/develop/tests/test_mapper.cc", line 79, in test_dpt
#3    Source "/data/quantum/openql-work/develop/src/program.cc", line 353, in compile
#2    Source "/data/quantum/openql-work/develop/src/arch/cc_light/cc_light_eqasm_compiler.cc", line 902, in compile
#1    Source "/data/quantum/openql-work/develop/src/arch/cc_light/cc_light_eqasm_compiler.cc", line 748, in map
#0    Source "/data/quantum/openql-work/develop/src/mapper.cc", line 2952, in Init

(location of the test exception was just arbitrarily chosen, of course)

QuTech-Delft / OpenQL

Add stack trace to ql::exception message #366