cmd: emit dwarf for string constants

[Zxilly]

After this patch, the size of bin/go increased from 18700k to 18712k (0.06%).

Updates #14517
Fixes #67744

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Message from Zxilly Chou:

Patch Set 1:

(1 comment)

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Message from Keith Randall:

Patch Set 1:

(5 comments)

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Message from Zxilly Chou:

Patch Set 1:

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Message from Zxilly Chou:

Patch Set 1:

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Message from Zxilly Chou:

Patch Set 1:

(1 comment)

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Message from Zxilly Chou:

Patch Set 2:

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Message from Keith Randall:

Patch Set 4:

(2 comments)

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Message from Zxilly Chou:

Patch Set 4:

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