codegen: add emitting of unary exprs

examples/hello.ry

@@ -37,7 +37,7 @@ fn func_refer_param(b: i32) i32 {
 
 fn multwo(num: i32, double_flag: bool) i32 {
     if (!double_flag) {
-        var value = false;
+        var value = 32;
         return value;
     }
 

src/analysis.zig

@@ -214,9 +214,9 @@ pub const TypeSolver = struct {
                 };
             },
 
-            // for now, unary operators only have .Not
             .Unary => |unary| {
                 var right_type = try self.resolveExprType(ctx, unary.right);
+
                 return switch (unary.op) {
                     .Negate => right_type,
                     .Not => right_type,

src/codegen.zig

@@ -132,6 +132,15 @@ pub const Codegen = struct {
                 };
             },
 
+            .Unary => |unary| {
+                var right = try self.emitExpr(builder, unary.right);
+
+                return switch (unary.op) {
+                    .Negate => llvm.LLVMBuildNeg(builder, right, c"neg_tmp"),
+                    .Not => llvm.LLVMBuildNot(builder, right, c"neg_tmp"),
+                };
+            },
+
             .Binary => |binary| {
                 var left = try self.emitExpr(builder, binary.left);
                 var right = try self.emitExpr(builder, binary.right);