net/http/httptrace: compose ClientTrace without reflect

[ydnar]

This is to enable use of package httptrace on TinyGo, which does not have an implementation of reflect.MakeFunc.

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Patch Set 1:

(1 comment)

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Patch Set 1:

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[gopherbot]

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[gopherbot]

This PR (HEAD: 87c83bf) has been imported to Gerrit for code review.

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