internal/buildcfg: enable randomizedHeapBase64 by default

Change-Id: If2493546cd9c4e5bb6736fe3c029e60957716f6a
Reviewed-on: https://go-review.googlesource.com/c/go/+/690296
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Michael Knyszek <[email protected]>

Author: rolandshoemaker

src/internal/buildcfg/exp.go

@@ -79,9 +79,10 @@ func ParseGOEXPERIMENT(goos, goarch, goexp string) (*ExperimentFlags, error) {
 	dwarf5Supported := (goos != "darwin" && goos != "ios" && goos != "aix")
 
 	baseline := goexperiment.Flags{
-		RegabiWrappers: regabiSupported,
-		RegabiArgs:     regabiSupported,
-		Dwarf5:         dwarf5Supported,
+		RegabiWrappers:       regabiSupported,
+		RegabiArgs:           regabiSupported,
+		Dwarf5:               dwarf5Supported,
+		RandomizedHeapBase64: true,
 	}
 
 	// Start with the statically enabled set of experiments.