Initial 64-bit recompiler.

Various 64-bit fixes.
Various fixes to allow building under MinGW-w64.

src/codegen_x86-64.h

@@ -0,0 +1,19 @@
+#define BLOCK_SIZE 0x4000
+#define BLOCK_MASK 0x3fff
+#define BLOCK_START 0
+
+#define HASH_SIZE 0x20000
+#define HASH_MASK 0x1ffff
+
+#define HASH(l) ((l) & 0x1ffff)
+
+#define BLOCK_EXIT_OFFSET 0x7f0
+#define BLOCK_GPF_OFFSET (BLOCK_EXIT_OFFSET - 20)
+
+enum
+{
+        OP_RET = 0xc3
+};
+
+#define NR_HOST_REGS 3
+extern int host_reg_mapping[NR_HOST_REGS];