Squashed 'externals/xbyak/' content from commit d512551e

git-subtree-dir: externals/xbyak
git-subtree-split: d512551e914737300ba35f3c049d1b40effbe76d

gen/b2hex.cpp

@@ -0,0 +1,17 @@
+#include <stdio.h>
+
+int main()
+{
+	puts("enum {");
+	for (int i = 0; i < 256; i++) {
+		printf("	B");
+		for (int j = 0; j < 8; j++) {
+			putchar(i & (1 << (7 - j)) ? '1' : '0');
+		}
+		printf("= %d", i);
+		if (i < 255) putchar(',');
+		putchar('\n');
+	}
+	puts("};");
+	return 0;
+}