public void setZeroGram(int flavor) {
		int hash = depthZeroHash(flavor);
		ngrams.get(0).hash = hash;
	}
Recompute the 0-gram, adding some additional salt to the hash
@param flavor is the salt value to add
Ghidra/Features/CodeCompare/src/main/java/ghidra/features/codecompare/graphanalysis/CtrlVertex.java