If a hex literal has an 'd' of 'f' in it, such as '0xf' or '0xd', the compiler fails with illegal tree structure.

The other hex literals work.  The issue is probably related to using `f` and `d` in float and double literals.

```
    public void testHexCollisionDouble() {
        assertEquals(13, exec("return 0xd"));
    }

    public void testHexCollisionFloat() {
        assertEquals(15, exec("return 0xf"));
    }

    public void testHex() throws Exception {
        for (int i = 0; i <= 15; i++) {
            String hex = Integer.toHexString(i);
            if ("d".equals(hex) || "f".equals(hex)) {
                continue;
            }
            assertEquals(i, exec("return 0x" + hex));
            assertEquals(i, exec("return 0x" + hex.toUpperCase(Locale.ROOT)));
            assertEquals(i, exec("return 0X" + hex));
            assertEquals(i, exec("return 0X" + hex.toUpperCase(Locale.ROOT)));
        }
    }
```
modules/lang-painless/src/main/java/org/elasticsearch/painless/phase/DefaultSemanticAnalysisPhase.java
"cannot resolve symbol ["
                            + semanticScope.getDecoration(userExpressionNode, PartialCanonicalTypeName.class).partialCanonicalTypeName()
                            + "]"
                    )
                );
            }
            if (semanticScope.hasDecoration(userExpressionNode, StaticType.class)) {
                throw userExpressionNode.createError(
                    new IllegalArgumentException(
                        "value required: instead found unexpected type "
                            + "["
                            + semanticScope.getDecoration(userExpressionNode, StaticType.class).getStaticCanonicalTypeName()
                            + "]"
                    )
                );
            }
            if (semanticScope.hasDecoration(userExpressionNode, ValueType.class) == false) {
                throw userExpressionNode.createError(new IllegalStateException("value required: instead found no value"));
            }
        }
    }
    /**
     * Visits a class.
     */
    public void visitClass(SClass userClassNode, ScriptScope scriptScope) {
        for (SFunction userFunctionNode : userClassNode.getFunctionNodes()) {
            visitFunction(userFunctionNode, scriptScope);
        }
    }
    /**