protected RVal lit(long val, int size) {
		return new LiteralLongExpr(this, val, size);
	}
Generate a literal (or immediate or constant) value

<p>
<b>WARNING:</b> Passing a literal int that turns out to be negative (easy to do in hex
notation) can be perilous. For example, 0xdeadbeef will actually result in 0xffffffffdeadbeef
because Java will cast it to a long before it's passed into this method. Use 0xdeadbeefL
instead.

@param val the value
@param size the size of the value in bytes
@return a handle to the value
Ghidra/Features/SystemEmulation/src/main/java/ghidra/pcode/struct/StructuredSleigh.java