Added crash guard to mutation and modified dbg build run script

Author: Zia-Rashid

Sources/Fuzzilli/Corpus/BasicCorpus.swift

@@ -100,6 +100,7 @@ public class BasicCorpus: ComponentBase, Collection, Corpus {
 
     /// Returns a random program from this corpus and increases its age by one.
     public func randomElementForMutating() -> Program {
+        assert(programs.count > 0) // if corpus is empty, this mutation will crash
         let idx = Int.random(in: 0..<programs.count)
         ages[idx] += 1
         let program = programs[idx]

runFuzzilli_dbg.sh

@@ -1 +1 @@
-swift run FuzzilliCli --profile=v8debug --engine=multi --resume --corpus=basic --storagePath=./Corpus --logLevel=verbose --timeout=1500 --diagnostics /home/diddy/v8/v8/out/fuzzbuild/d8
+swift run FuzzilliCli --profile=v8debug --engine=multi --resume --corpus=basic --storagePath=./Corpus --logLevel=verbose --timeout=1500 --diagnostics /home/diddy/v8/v8/out/fuzzbuild_dbg/d8