add initial xop codepaths, still need to finish the rest of the compares, and then do shifts, rotates, and PERMUTE

Add vector simplification pass, so far it only recognizes whether VECTOR_DENORMFLUSH is useless and optimizes them away
Tag restgplr/savegplr/restvmx/savevmx/restfpr/savefpr with useful information, i intend to inline them (they tend to be the most heavily called guest functions)

src/xenia/cpu/function.h

@@ -31,10 +31,11 @@ struct SourceMapEntry {
   uint32_t hir_offset;     // Block ordinal (16b) | Instr ordinal (16b)
   uint32_t code_offset;    // Offset from emitted code start.
 };
+enum class SaveRestoreType : uint8_t { NONE, GPR, VMX, FPR };
 
 class Function : public Symbol {
  public:
-  enum class Behavior {
+  enum class Behavior : uint8_t {
     kDefault = 0,
     kProlog,
     kEpilog,
@@ -53,6 +54,20 @@ class Function : public Symbol {
   void set_behavior(Behavior value) { behavior_ = value; }
   bool is_guest() const { return behavior_ != Behavior::kBuiltin; }
 
+  void SetSaverest(SaveRestoreType type, bool is_rest, uint8_t index) {
+    saverest_type_ = type;
+    is_restore_ = is_rest;
+    saverest_index_ = index;
+  }
+
+  bool IsSaverest() const { return saverest_type_ != SaveRestoreType::NONE; }
+
+  SaveRestoreType SaverestType() const { return saverest_type_; }
+  unsigned SaverestIndex() const { return saverest_index_; }
+
+  bool IsSave() const { return IsSaverest() && is_restore_ == 0; }
+  bool IsRestore() const { return IsSaverest() && is_restore_; }
+
   bool ContainsAddress(uint32_t address) const {
     if (!address_ || !end_address_) {
       return false;
@@ -71,7 +86,11 @@ class Function : public Symbol {
   Function(Module* module, uint32_t address);
 
   uint32_t end_address_ = 0;
+
   Behavior behavior_ = Behavior::kDefault;
+  SaveRestoreType saverest_type_ = SaveRestoreType::NONE;
+  uint8_t is_restore_ = 0;
+  uint8_t saverest_index_ = 0;
 };
 
 class BuiltinFunction : public Function {