[PPC] Shuffle code around to make it cleaner to modify by hand.

- [PPC] Rename ppc_opcode_lookup.cc, ppc_opcode_table.cc to have a _gen
suffix to make it more obvious about their autogenerated nature.
- [PPC] Move autogenerated code from ppc_opcode_disasm.cc to
ppc_opcode_disasm_gen.cc.
- [PPC] Update ppc-table-gen to allow for blacklisting of certain
instructions that have custom disasm code.

src/xenia/cpu/ppc/ppc_opcode_disasm.h

@@ -0,0 +1,33 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2015 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#ifndef XENIA_CPU_PPC_PPC_OPCODE_DISASM_H_
+#define XENIA_CPU_PPC_PPC_OPCODE_DISASM_H_
+
+#include <cstdint>
+
+#include "xenia/base/string_buffer.h"
+#include "xenia/cpu/ppc/ppc_opcode.h"
+
+namespace xe {
+namespace cpu {
+namespace ppc {
+
+constexpr size_t kNamePad = 11;
+const uint8_t kSpaces[kNamePad] = {0x20, 0x20, 0x20, 0x20, 0x20,
+                                   0x20, 0x20, 0x20, 0x20, 0x20};
+void PadStringBuffer(StringBuffer* str, size_t base, size_t pad);
+
+void PrintDisasm_bcx(const PPCDecodeData& d, StringBuffer* str);
+
+}  // namespace ppc
+}  // namespace cpu
+}  // namespace xe
+
+#endif  // XENIA_CPU_PPC_PPC_OPCODE_INFO_H_