-g: debug info, in the compiler written in Finch

DWARF as LLVM metadata: a compile unit, a subprogram per function, a location on every call, a variable
for each local and parameter with types a debugger can open (structs with their fields, arrays and text
as ptr/len/cap, maps, enums with their variants, pointers, fixed arrays). Methods show self.

Use it with -O0, as the docs say: the optimizer inlines the program into main, which has no debug info.
boot.sh builds ten programs with -g -O0 and checks they still behave. 51 passed.

tests/boot.sh

@@ -60,6 +60,20 @@ for f in tests/new/fail/*.fch; do
         echo "$got" | head -3
     fi
 done
+# the same programs with debug info (-g -O0): the metadata has to be valid for every kind of thing a program has
+for f in tests/new/enums.fch tests/new/generics.fch tests/new/std_json.fch tests/run/basics.fch tests/run/methods_basic.fch \
+         tests/run/maps.fch tests/run/errors.fch tests/run/defer.fch tests/run/c_structs.fch tests/run/memory.fch; do
+    input="${f%.fch}.in"
+    [ -f "$input" ] || input=/dev/null
+    if "$boot" build "$f" -g -O0 -o "$tmp/progg" > "$tmp/err" 2>&1 && [ "$("$tmp/progg" < "$input" 2>&1)" == "$(cat "${f%.fch}.out")" ]; then
+        pass=$((pass + 1))
+    else
+        failed=$((failed + 1))
+        echo "FAIL (-g) $f"
+        head -3 "$tmp/err"
+    fi
+done
+
 # a library a C program loads (finch build --shared), with the compiler under test
 if FINCH_RT="$PWD/runtime/finch_rt.c" FINCH="$boot" tests/shared.sh > "$tmp/shared.out" 2>&1; then
     pass=$((pass + 1))