[Bug binutils/27386] [readelf] DW_UT_split_compile and DW_UT_skeleton support

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=27386

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
Created attachment 13214
  --> https://sourceware.org/bugzilla/attachment.cgi?id=13214&action=edit
Tentative patch

Does not print dwo_id, but at least manages to print contents of CUs, such that
we have:
...
$ ~/binutils/build/binutils/readelf -w a.out > READELF
$ 
...
and:
...
  Compilation Unit @ offset 0xc7:
   Length:        0x31 (32-bit)
   Version:       5
   Unit Type:     DW_UT_skeleton (4)
   Abbrev Offset: 0x64
   Pointer Size:  8
 <0><db>: Abbrev Number: 1 (DW_TAG_skeleton_unit)
    <dc>   DW_AT_low_pc      : 0x400507
    <e4>   DW_AT_high_pc     : 0x15
    <ec>   DW_AT_stmt_list   : 0xe9
    <f0>   DW_AT_dwo_name    : (indirect string, offset: 0x1dc): hello.dwo
    <f4>   DW_AT_comp_dir    : (indirect string, offset: 0x1d0): /home/vries
    <f8>   DW_AT_GNU_pubnames: 1
    <f8>   DW_AT_GNU_addr_base: 0x0    
...
and:
...
  Compilation Unit @ offset 0x0:
   Length:        0x229 (32-bit)
   Version:       5
   Unit Type:     DW_UT_split_compile (5)
   Abbrev Offset: 0x0
   Pointer Size:  8
 <0><14>: Abbrev Number: 12 (DW_TAG_compile_unit)
    <15>   DW_AT_producer    : (indexed string: 0x15): GNU C11 7.5.0
-mtune=generic -march=x86-64 -gsplit-dwarf -gdwarf-5
    <16>   DW_AT_language    : 29       (C11)
    <17>   DW_AT_name        : (indexed string: 0x36): hello.c
    <18>   DW_AT_comp_dir    : (indexed string: 0x3a): /home/vries
...

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