stage2 AArch64: add more slice support

* airSlice
* airArrayToSlice
* and initial support for airSlicePtr and co

test/behavior/enum.zig

@@ -11,8 +11,6 @@ fn shouldEqual(n: Number, expected: u3) !void {
 }
 
 test "enum to int" {
-    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
-
     try shouldEqual(Number.Zero, 0);
     try shouldEqual(Number.One, 1);
     try shouldEqual(Number.Two, 2);
@@ -558,8 +556,6 @@ const ValueCount257 = enum {
 };
 
 test "enum sizes" {
-    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
-
     comptime {
         try expect(@sizeOf(ValueCount1) == 0);
         try expect(@sizeOf(ValueCount2) == 1);
@@ -569,8 +565,6 @@ test "enum sizes" {
 }
 
 test "enum literal equality" {
-    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
-
     const x = .hi;
     const y = .ok;
     const z = .hi;
@@ -580,8 +574,6 @@ test "enum literal equality" {
 }
 
 test "enum literal cast to enum" {
-    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
-
     const Color = enum { Auto, Off, On };
 
     var color1: Color = .Auto;
@@ -590,8 +582,6 @@ test "enum literal cast to enum" {
 }
 
 test "peer type resolution with enum literal" {
-    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
-
     const Items = enum { one, two };
 
     try expect(Items.two == .two);
@@ -668,8 +658,6 @@ test "non-exhaustive enum" {
 }
 
 test "empty non-exhaustive enum" {
-    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
-
     const S = struct {
         const E = enum(u8) { _ };
 
@@ -732,8 +720,6 @@ const EnumWithTagValues = enum(u4) {
     D = 1 << 3,
 };
 test "enum with tag values don't require parens" {
-    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
-
     try expect(@enumToInt(EnumWithTagValues.C) == 0b0100);
 }
 
@@ -750,8 +736,6 @@ const MultipleChoice2 = enum(u32) {
 };
 
 test "cast integer literal to enum" {
-    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
-
     try expect(@intToEnum(MultipleChoice2, 0) == MultipleChoice2.Unspecified1);
     try expect(@intToEnum(MultipleChoice2, 40) == MultipleChoice2.B);
 }
@@ -783,8 +767,6 @@ const Small2 = enum(u2) { One, Two };
 const Small = enum(u2) { One, Two, Three, Four };
 
 test "set enum tag type" {
-    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
-
     {
         var x = Small.One;
         x = Small.Two;
@@ -798,8 +780,6 @@ test "set enum tag type" {
 }
 
 test "casting enum to its tag type" {
-    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
-
     try testCastEnumTag(Small2.Two);
     comptime try testCastEnumTag(Small2.Two);
 }
@@ -809,8 +789,6 @@ fn testCastEnumTag(value: Small2) !void {
 }
 
 test "enum with 1 field but explicit tag type should still have the tag type" {
-    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
-
     const Enum = enum(u8) {
         B = 2,
     };
@@ -818,8 +796,6 @@ test "enum with 1 field but explicit tag type should still have the tag type" {
 }
 
 test "signed integer as enum tag" {
-    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
-
     const SignedEnum = enum(i2) {
         A0 = -1,
         A1 = 0,
@@ -832,8 +808,6 @@ test "signed integer as enum tag" {
 }
 
 test "enum with one member and custom tag type" {
-    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
-
     const E = enum(u2) {
         One,
     };
@@ -845,8 +819,6 @@ test "enum with one member and custom tag type" {
 }
 
 test "enum with one member and u1 tag type @enumToInt" {
-    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
-
     const Enum = enum(u1) {
         Test,
     };
@@ -854,8 +826,6 @@ test "enum with one member and u1 tag type @enumToInt" {
 }
 
 test "enum with comptime_int tag type" {
-    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
-
     const Enum = enum(comptime_int) {
         One = 3,
         Two = 2,
@@ -865,8 +835,6 @@ test "enum with comptime_int tag type" {
 }
 
 test "enum with one member default to u0 tag type" {
-    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
-
     const E0 = enum { X };
     comptime try expect(Tag(E0) == u0);
 }
@@ -883,15 +851,11 @@ fn doALoopThing(id: EnumWithOneMember) void {
 }
 
 test "comparison operator on enum with one member is comptime known" {
-    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
-
     doALoopThing(EnumWithOneMember.Eof);
 }
 
 const State = enum { Start };
 test "switch on enum with one member is comptime known" {
-    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
-
     var state = State.Start;
     switch (state) {
         State.Start => return,
@@ -900,8 +864,6 @@ test "switch on enum with one member is comptime known" {
 }
 
 test "method call on an enum" {
-    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
-
     const S = struct {
         const E = enum {
             one,
@@ -1141,8 +1103,6 @@ fn getC(data: *const BitFieldOfEnums) C {
 }
 
 test "enum literal in array literal" {
-    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest;
-
     const Items = enum { one, two };
     const array = [_]Items{ .one, .two };