InternPool: implement hasRuntimeBitsAdvanced for simple_type

src/Sema.zig

@@ -32821,6 +32821,7 @@ pub fn typeHasOnePossibleValue(sema: *Sema, ty: Type) CompileError!?Value {
             .undefined => return Value.undef,
 
             .generic_poison => return error.GenericPoison,
+            .var_args_param => unreachable,
         },
         .struct_type => @panic("TODO"),
         .simple_value => unreachable,

src/type.zig

@@ -2440,7 +2440,55 @@ pub const Type = struct {
             .vector_type => @panic("TODO"),
             .optional_type => @panic("TODO"),
             .error_union_type => @panic("TODO"),
-            .simple_type => @panic("TODO"),
+            .simple_type => |t| return switch (t) {
+                .f16,
+                .f32,
+                .f64,
+                .f80,
+                .f128,
+                .usize,
+                .isize,
+                .c_char,
+                .c_short,
+                .c_ushort,
+                .c_int,
+                .c_uint,
+                .c_long,
+                .c_ulong,
+                .c_longlong,
+                .c_ulonglong,
+                .c_longdouble,
+                .bool,
+                .anyerror,
+                .@"anyframe",
+                .anyopaque,
+                .atomic_order,
+                .atomic_rmw_op,
+                .calling_convention,
+                .address_space,
+                .float_mode,
+                .reduce_op,
+                .call_modifier,
+                .prefetch_options,
+                .export_options,
+                .extern_options,
+                => true,
+
+                // These are false because they are comptime-only types.
+                .void,
+                .type,
+                .comptime_int,
+                .comptime_float,
+                .noreturn,
+                .null,
+                .undefined,
+                .enum_literal,
+                .type_info,
+                => false,
+
+                .generic_poison => unreachable,
+                .var_args_param => unreachable,
+            },
             .struct_type => @panic("TODO"),
             .simple_value => unreachable,
             .extern_func => unreachable,
@@ -2500,7 +2548,6 @@ pub const Type = struct {
             .@"anyframe",
             .anyopaque,
             .@"opaque",
-            .type_info,
             .error_set_single,
             .error_union,
             .error_set,
@@ -2545,6 +2592,7 @@ pub const Type = struct {
             .enum_literal,
             .empty_struct,
             .empty_struct_literal,
+            .type_info,
             // These are function *bodies*, not pointers.
             // Special exceptions have to be made when emitting functions due to
             // this returning false.
@@ -5075,6 +5123,7 @@ pub const Type = struct {
                 .undefined => return Value.undef,
 
                 .generic_poison => unreachable,
+                .var_args_param => unreachable,
             },
             .struct_type => @panic("TODO"),
             .simple_value => unreachable,