[llvm] [HWASAN] Follow up for #83503 implement selective instrumentation (PR #83942)

[Dmitry Vyukov via llvm-commits]

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@@ -188,9 +190,13 @@ static cl::opt<bool>
 static cl::opt<int> HotPercentileCutoff("hwasan-percentile-cutoff-hot",
                                         cl::init(0));
 
-STATISTIC(NumTotalFuncs, "Number of total funcs HWASAN");
-STATISTIC(NumInstrumentedFuncs, "Number of HWASAN instrumented funcs");
-STATISTIC(NumNoProfileSummaryFuncs, "Number of HWASAN funcs without PS");
+static cl::opt<float> SkipInstRandomRate(
+    "hwasan-skip-inst-random-rate", cl::init(0.0),
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dvyukov wrote:

Do we want to bound it to [0, 1000]? Please also add the expected range of values to the descirption.

https://github.com/llvm/llvm-project/pull/83942