Hex and binary literals with capital base specifiers aren't parsed correctly

[idavis]

From the spec for hex and binary literals, using x|X and b|B should be allowed. The values are lexed without error, but aren't handled correctly.

Here you can see the result of parsing int x = 0xFa_1F; and int x = 0XFa_1F; into an asg::Program

Program { version: None, stmts: [DeclareClassical(DeclareClassical { name: Ok(SymbolId(7)), initializer: Some(TExpr { expression: Cast(Cast { operand: TExpr { expression: Literal(Int(IntLiteral { value: 64031, sign: true })), ty: Int(Some(128), True) }, typ: Int(None, False) }), ty: Int(None, False) }) })] }
Program { version: None, stmts: [DeclareClassical(DeclareClassical { name: Ok(SymbolId(7)), initializer: Some(TExpr { expression: Cast(Cast { operand: TExpr { expression: Literal(Int(IntLiteral { value: 0, sign: true })), ty: Int(Some(128), True) }, typ: Int(None, False) }), ty: Int(None, False) }) })] }

And the result of parsing int x = 0b1010_1100; and int x = 0B1010_1100; into an asg::Program

Program { version: None, stmts: [DeclareClassical(DeclareClassical { name: Ok(SymbolId(7)), initializer: Some(TExpr { expression: Cast(Cast { operand: TExpr { expression: Literal(Int(IntLiteral { value: 172, sign: true })), ty: Int(Some(128), True) }, typ: Int(None, False) }), ty: Int(None, False) }) })] }
Program { version: None, stmts: [DeclareClassical(DeclareClassical { name: Ok(SymbolId(7)), initializer: Some(TExpr { expression: Cast(Cast { operand: TExpr { expression: Literal(Int(IntLiteral { value: 0, sign: true })), ty: Int(Some(128), True) }, typ: Int(None, False) }), ty: Int(None, False) }) })] }

In both cases the IntLiteral value is 0 instead of the correct value when the base specifier is a capital.