Clean up more tests

Remove tools/generate-content.py.
We will use a generic tool intended for llvm/utils: https://discourse.llvm.org/t/utility-to-generate-elaborated-assembly-ir-tests/78408

Author: MaskRay

lld/test/ELF/Inputs/debug-names-a.s

@@ -3,7 +3,7 @@
 struct t1 {};
 extern "C" void _start(t1) {}
 #--- gen
-clang -S -g -gpubnames a.cc -o -
+clang --target=x86_64-linux -S -g -gpubnames a.cc -o -
 .endif
 	.text
 	.file	"a.cc"

lld/test/ELF/Inputs/debug-names-b.s

@@ -6,7 +6,7 @@ struct t2 {};
 }
 int main() { t1 v1; ns::t2 v2; }
 #--- gen
-clang -S -g -gpubnames b.cc -o -
+clang --target=x86_64-linux -S -g -gpubnames b.cc -o -
 .endif
 	.text
 	.file	"b.cc"

lld/test/ELF/Inputs/debug-names-bcd.s

@@ -22,6 +22,12 @@
 # ENTRY-OFFSET-IN-BYTE-COUNT-2: error: entry-offset-in-byte.o:(.debug_names): index entry is out of bounds
 
 ## Test errors in the abbrev table.
+# RUN: sed -E '/DW_IDX_parent/{n;s/[0-9]+.*DW_FORM_flag_present/16/}' %S/Inputs/debug-names-a.s > bad-parent-form.s
+# RUN: llvm-mc -filetype=obj -triple=x86_64 bad-parent-form.s -o bad-parent-form.o
+# RUN: not ld.lld --debug-names bad-parent-form.o 2>&1 | FileCheck %s --check-prefix=BAD-PARENT-FORM --implicit-check-not=error:
+
+# BAD-PARENT-FORM-COUNT-2: error: bad-parent-form.o:(.debug_names): invalid form for DW_IDX_parent
+
 # RUN: sed -E '/DW_IDX_die_offset/{n;s/[0-9]+.*DW_FORM_ref4/16/}' %S/Inputs/debug-names-a.s > bad-die-form.s
 # RUN: llvm-mc -filetype=obj -triple=x86_64 bad-die-form.s -o bad-die-form.o
 # RUN: not ld.lld --debug-names bad-die-form.o 2>&1 | FileCheck %s --check-prefix=BAD-DIE-FORM --implicit-check-not=error:

lld/test/ELF/Inputs/debug-names-ef.s

@@ -10,7 +10,7 @@
 struct t1 {};
 extern "C" void _start(t1) {}
 //--- gen
-clang -S -g -gpubnames -gdwarf64 a.cc -o -
+clang --target=x86_64-linux -S -g -gpubnames -gdwarf64 a.cc -o -
 .endif
 	.text
 	.file	"a.cc"