[CGData][llvm-cgdata] Support for stable function map (#112664)

This introduces a new cgdata format for stable function maps. The raw
data is embedded in the __llvm_merge section during compile tim

[CGData][llvm-cgdata] Support for stable function map (#112664)

This introduces a new cgdata format for stable function maps. The raw
data is embedded in the __llvm_merge section during compile time. This
data can be read and merged using the llvm-cgdata tool, into an indexed
cgdata file. Consequently, the tool is now capable of handling either
outlined hash trees, stable function maps, or both, as they are
orthogonal.

Depends on #112662.
This is a patch for
https://discourse.llvm.org/t/rfc-global-function-merging/82608.

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Reland [CGData] llvm-cgdata #89884 (#101461)

Reland [CGData] llvm-cgdata #89884 using `Opt` instead of `cl`
- Action options are required, `--convert`, `--show`, `--merge`. This
was similar to sub

Reland [CGData] llvm-cgdata #89884 (#101461)

Reland [CGData] llvm-cgdata #89884 using `Opt` instead of `cl`
- Action options are required, `--convert`, `--show`, `--merge`. This
was similar to sub-commands previously implemented, but having a prefix
`--`.
- `--format` option is added, which specifies `text` or `binary`.

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Co-authored-by: Kyungwoo Lee <kyulee@fb.com>

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