profile: optimize Parse allocs #951
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`go test -bench='^\QBenchmarkParse\E$' -run='^$' -count=10 -benchtime=5s`
```
goos: linux
goarch: amd64
pkg: github.com/google/pprof/profile
cpu: 13th Gen Intel(R) Core(TM) i7-1360P
│ old-parse.txt │ new-parse.txt │
│ sec/op │ sec/op vs base │
Parse-16 62.07m ± 13% 55.54m ± 13% -10.52% (p=0.035 n=10)
│ old-parse.txt │ new-parse.txt │
│ B/op │ B/op vs base │
Parse-16 47.56Mi ± 0% 41.09Mi ± 0% -13.59% (p=0.000 n=10)
│ old-parse.txt │ new-parse.txt │
│ allocs/op │ allocs/op vs base │
Parse-16 272.9k ± 0% 175.8k ± 0% -35.58% (p=0.000 n=10)
```
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go test -bench='^\QBenchmarkParse\E$' -run='^$' -count=10 -benchtime=5s