Merge remote-tracking branch 'origin/master' into stage2-whole-file-astgen

Conflicts:
 * doc/langref.html.in
 * lib/std/enums.zig
 * lib/std/fmt.zig
 * lib/std/hash/auto_hash.zig
 * lib/std/math.zig
 * lib/std/mem.zig
 * lib/std/meta.zig
 * test/behavior/alignof.zig
 * test/behavior/bitcast.zig
 * test/behavior/bugs/1421.zig
 * test/behavior/cast.zig
 * test/behavior/ptrcast.zig
 * test/behavior/type_info.zig
 * test/behavior/vector.zig

Master branch added `try` to a bunch of testing function calls, and some
lines also had changed how to refer to the native architecture and other
`@import("builtin")` stuff.

test/behavior/src.zig

@@ -2,16 +2,16 @@ const std = @import("std");
 const expect = std.testing.expect;
 
 test "@src" {
-    doTheTest();
+    try doTheTest();
 }
 
-fn doTheTest() void {
+fn doTheTest() !void {
     const src = @src();
 
-    expect(src.line == 9);
-    expect(src.column == 17);
-    expect(std.mem.endsWith(u8, src.fn_name, "doTheTest"));
-    expect(std.mem.endsWith(u8, src.file, "src.zig"));
-    expect(src.fn_name[src.fn_name.len] == 0);
-    expect(src.file[src.file.len] == 0);
+    try expect(src.line == 9);
+    try expect(src.column == 17);
+    try expect(std.mem.endsWith(u8, src.fn_name, "doTheTest"));
+    try expect(std.mem.endsWith(u8, src.file, "src.zig"));
+    try expect(src.fn_name[src.fn_name.len] == 0);
+    try expect(src.file[src.file.len] == 0);
 }