[DWARFDump] Make --verify handle all sections by default

The current behavior of --verify is that it only verifies debug_info,
debug_abbrev and debug_names. This seems fairly arbitrary and might have been
unintentional, as originally the absence of any section flags implied "all".

This patch changes the behavior so that the verifier now verifies everything by
default. It revealed two tests that had potentially invalid DWARF:

1. dwarfdump-str-offsets.s is adding padding between two debug_str_offset
contributions. The standard does not explicitly allow this behavior. See issue
#81558

2. dwarf5-macro.test uses a checked-in binary that has invalid
debug_str_offsets. One of its entries points to the _middle_ of the string
section:

error: .debug_str_offsets: contribution 0x0: index 0x4: invalid string offset
*0x18 == 0x455D, is neither zero nor immediately following a null character

If we look at the closest offset to 0x455D in debug_str:

```
0x0000454e: "__SLONG32_TYPE int"
```

0x455D points to "int".

llvm/test/DebugInfo/X86/dwarfdump-str-offsets.s

@@ -1,6 +1,9 @@
 # RUN: llvm-mc -triple x86_64-unknown-linux %s -filetype=obj -o %t.o
 # RUN: llvm-dwarfdump -v %t.o 2> %t.err | FileCheck --check-prefixes=COMMON,SPLIT,OFFSETS %s
-# RUN: llvm-dwarfdump -verify %t.o | FileCheck --check-prefix=VERIFY %s
+
+# FIXME: the verifier does not accept padding between debug-str-offset
+# sections, which this test uses.
+# RUN: llvm-dwarfdump -verify --debug-info %t.o | FileCheck --check-prefix=VERIFY %s
 # RUN: llvm-dwarfdump -debug-str-offsets %t.o | FileCheck --check-prefix=OFFSETS %s
 # 
 # Check that we don't report an error on a non-existent range list table.

llvm/test/DebugInfo/X86/skeleton-unit-verify.s

@@ -11,6 +11,8 @@
 # CHECK-NEXT: DW_TAG_skeleton_unit
 # CHECK-NEXT: error: Skeleton compilation unit has children.
 # CHECK-NEXT: Verifying dwo Units...
+# CHECK-NEXT: Verifying .debug_line...
+# CHECK-NEXT: Verifying .debug_str_offsets...
 # CHECK-NEXT: Errors detected.
 
         .section .debug_abbrev,"",@progbits

llvm/test/tools/llvm-dwarfdump/X86/verify_file_encoding.yaml

@@ -51,6 +51,8 @@
 # CHECK-NEXT:               DW_AT_call_file   [DW_FORM_sdata] (4)
 # CHECK-NEXT:               DW_AT_call_line   [DW_FORM_sdata] (5){{[[:space:]]}}
 # CHECK-NEXT: Verifying dwo Units...
+# CHECK-NEXT: Verifying .debug_line...
+# CHECK-NEXT: Verifying .debug_str_offsets...
 # CHECK-NEXT: error: Aggregated error counts:
 # CHECK-NEXT: error: Invalid encoding in DW_AT_decl_file occurred 4 time(s).
 # CHECK-NEXT: error: Invalid file index in DW_AT_call_line occurred 1 time(s).

llvm/test/tools/llvm-dwarfutil/ELF/X86/dwarf5-macro.test

@@ -45,12 +45,15 @@
 
 ## Check that macro table preserved during simple copying.
 #
+# FIXME: the input of this test is itself invalid w.r.t. debug_str_offsets,
+# which also causes the next two calls to --verify to fail, so we only verify
+# debug_info on those.
 #RUN: llvm-dwarfutil --no-garbage-collection %p/Inputs/dwarf5-macro.out %t1
-#RUN: llvm-dwarfdump -verify %t1 | FileCheck %s
+#RUN: llvm-dwarfdump -verify --debug-info %t1 | FileCheck %s
 #RUN: llvm-dwarfdump -a  %t1 | FileCheck %s --check-prefix=MACRO
 
 #RUN: llvm-dwarfutil --linker parallel --no-garbage-collection %p/Inputs/dwarf5-macro.out %t1
-#RUN: llvm-dwarfdump -verify %t1 | FileCheck %s
+#RUN: llvm-dwarfdump -verify %t1 --debug-info | FileCheck %s
 #RUN: llvm-dwarfdump -a  %t1 | FileCheck %s --check-prefix=MACRO
 
 ## Check that macro table preserved during updating accelerator tables.

llvm/tools/llvm-dwarfdump/llvm-dwarfdump.cpp

@@ -866,7 +866,8 @@ int main(int argc, char **argv) {
     if (Verbose)
       DumpType = DIDT_All;
     else
-      DumpType = DIDT_DebugInfo;
+      // If no options are passed, verify everything but dump only debug_info.
+      DumpType = Verify ? DIDT_All : DIDT_DebugInfo;
   }
 
   // Unless dumping a specific DIE, default to --show-children.