go.ast: add CommentGroup.Raw function

[oldme-git]

Dear Reviewer:

Sometimes, We need to get the raw (original) comments to generate some go template files. But CommentGroup.Text does not get the raw (original) comments. This makes it difficult to add comments to the generated template file.
Thank you for your contribution to go! Have a good day!

Fixes #67047

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Patch Set 1:

(1 comment)

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Patch Set 1:

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Message from Robert Griesemer:

Patch Set 2: Hold+1

(3 comments)

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Patch Set 4:

(1 comment)

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Patch Set 4: Hold+1

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