Commits on Jan 1, 2022

1. ruleguard: add profiling labels support …

   When ruleguard is compiled with `--tags pproflabels`, profiling
   will record per rules group labels, like `rules:groupname`.
   
   This makes it easies to find the rules that may need to be
   optimized or re-written in some other way.
   
   Build tags protection is used to avoid the overhead in
   the normal mode, when labels are not needed.
   
   ```
   (pprof) tags
    rules: Total 2.3s
           410.0ms (18.14%): dupArg
           350.0ms (15.49%): offBy1
           250.0ms (11.06%): badLock
           160.0ms ( 7.08%): argOrder
           140.0ms ( 6.19%): equalFold
           120.0ms ( 5.31%): redundantSprint
           110.0ms ( 4.87%): wrapperFunc
            90.0ms ( 3.98%): ioutilDeprecated
            80.0ms ( 3.54%): preferFprint
            70.0ms ( 3.10%): assignOp
            60.0ms ( 2.65%): badCall
            60.0ms ( 2.65%): externalErrorReassign
            60.0ms ( 2.65%): stringXbytes
            50.0ms ( 2.21%): valSwap
            40.0ms ( 1.77%): stringConcatSimplify
            40.0ms ( 1.77%): yodaStyleExpr
            20.0ms ( 0.88%): badSorting
            20.0ms ( 0.88%): flagDeref
            20.0ms ( 0.88%): httpNoBody
            20.0ms ( 0.88%): preferStringWriter
            20.0ms ( 0.88%): timeExprSimplify
            10.0ms ( 0.44%): dynamicFmtString
            10.0ms ( 0.44%): emptyStringTest
            10.0ms ( 0.44%): preferWriteByte
            10.0ms ( 0.44%): regexpMust
            10.0ms ( 0.44%): returnAfterHttpError
            10.0ms ( 0.44%): sloppyLen
            10.0ms ( 0.44%): sprintfQuotedString
   ```

   

   quasilyte committed Jan 1, 2022
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