Minor decoder optimizations, kernel fixes, cpu backend fixes

src/xenia/cpu/hir/label.h

@@ -26,6 +26,13 @@ class Label {
   char* name;
 
   void* tag;
+  // just use stringification of label id
+  // this will later be used as an input to xbyak. xbyak only accepts
+  // std::string as a value, not passed by reference, so precomputing the
+  // stringification does not help
+  std::string GetIdString() {
+	  return std::to_string(id);
+  }
 };
 
 }  // namespace hir

src/xenia/cpu/hir/opcodes.h

@@ -11,7 +11,7 @@
 #define XENIA_CPU_HIR_OPCODES_H_
 
 #include <cstdint>
-
+#include "xenia/base/platform.h"
 namespace xe {
 namespace cpu {
 namespace hir {
@@ -361,13 +361,16 @@ enum OpcodeSignature {
 #define GET_OPCODE_SIG_TYPE_SRC1(sig) (OpcodeSignatureType)((sig >> 3) & 0x7)
 #define GET_OPCODE_SIG_TYPE_SRC2(sig) (OpcodeSignatureType)((sig >> 6) & 0x7)
 #define GET_OPCODE_SIG_TYPE_SRC3(sig) (OpcodeSignatureType)((sig >> 9) & 0x7)
+XE_MAYBE_UNUSED
 static bool IsOpcodeBinaryValue(uint32_t signature) {
   return (signature & ~(0x7)) ==
          ((OPCODE_SIG_TYPE_V << 3) | (OPCODE_SIG_TYPE_V << 6));
 }
+XE_MAYBE_UNUSED
 static bool IsOpcodeUnaryValue(uint32_t signature) {
   return (signature & ~(0x7)) == ((OPCODE_SIG_TYPE_V << 3));
 }
+XE_MAYBE_UNUSED
 static void UnpackOpcodeSig(uint32_t sig, OpcodeSignatureType& dest,
                             OpcodeSignatureType& src1,
                             OpcodeSignatureType& src2,