Namespace getExternalNamespace(Program program, String[] path) {
		return getExternalNamespace(program, path, path.length);
	}
Changes the function's parameter indicated by index to be a stack
parameter with the indicated stack offset.
@param func the function
@param index the index of an existing parameter
@param stackOffset the stack offset for this parameter
Ghidra/Features/Base/src/test.slow/java/ghidra/app/merge/listing/AbstractExternalMergerTest.java