profile: change error message to print string representation of wire type #514
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The proto write type code stored in buffer stores unprintable values
(e.g. 2 when unmarshalling). The desired output when printing an error
message is the base-10 string representation of the integer (i.e. strconv.Itoa),
instead of the current behavior (string(int) or string(rune)), which return the
utf8 literal corresponding where the integer represents a unicode codepoint.
As pointed out by @ianlancetaylor in 4ac0da8#commitcomment-37524728,
commit 4ac0da8 preserves the previous incorrect behavior to pass a vet check,
whereas this change prints the desired output.
Updates golang/go#32479.