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Xing GUO 27bd788cf1 [DWARFYAML][debug_aranges] Replace InitialLength with Format and Length. 
This patch addresses the comment in [D80972](https://reviews.llvm.org/D80972#inline-744217).

Before this patch, the initial length field of .debug_aranges section should be declared as:

```
## 32-bit DWARF
debug_aranges:
  - Length:
      TotalLength: 0x20
    Version: 2
    ...

## 64-bit DWARF
debug_aranges:
  - Length:
      TotalLength:   0xffffffff
      TotalLength64: 0x20
    Version: 2
    ...
```

After this patch:

```
## 32-bit DWARF
debug_aranges:
  - [[Format:  DWARF32]] ## Optional
    Length:  0x20
    Version: 2
    ...

## 64-bit DWARF
debug_aranges:
  - Format:  DWARF64
    Length:  0x20
    Version: 2
```

Current implementation of generating DWARF64 .debug_aranges section is buggy. A follow-up patch will improve it and add test cases for DWARF64.

Reviewed By: jhenderson

Differential Revision: https://reviews.llvm.org/D81063
2020-06-05 12:16:44 +08:00
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