public WrapIf _elif(Expr cond, Runnable body) {
			IfStmt _elif = doIf(cond, body);
			_if.addElse(_elif);
			return new WrapIf(_elif);
		}
Generate an "else if" clause for the wrapped "if" statement

<p>
This is shorthand for {@code _else(_if(...))} but avoids the unnecessary nesting of
parentheses.

@param cond the condition
@param body the body of the clause
@return a wrapper to the second "if" statement
Ghidra/Features/SystemEmulation/src/main/java/ghidra/pcode/struct/StructuredSleigh.java