[CIR][Lowering][debuginfo] Disable debug info if -g is not specified

[PikachuHyA]

Fix #793

[smeenai]

Hmm. Switching from %clang_cc1 to %clang is potentially problematic, because the extra flags added by the driver might change results in undesirable ways. How much of a pain is it to update the checks in those tests instead? We can also figure out what the driver translates -g into and pass that to %clang_cc1.

[PikachuHyA]

Hmm. Switching from %clang_cc1 to %clang is potentially problematic, because the extra flags added by the driver might change results in undesirable ways. How much of a pain is it to update the checks in those tests instead?

all tests updated without changing %clang_cc1 to %clang

We can also figure out what the driver translates -g into and pass that to %clang_cc1.

replace -g with -debug-info-kind=constructor -dwarf-version=4. it works.

[seven-mile]

Thanks for digging this out! This seems to be the correct approach.