[dynarmic] use small vector experiment

Signed-off-by: lizzie <lizzie@eden-emu.dev>

src/dynarmic/src/dynarmic/backend/x64/reg_alloc.h

@@ -12,6 +12,7 @@
 #include <functional>
 #include <optional>
 
+#include "boost/container/small_vector.hpp"
 #include "dynarmic/common/common_types.h"
 #include <xbyak/xbyak.h>
 #include <boost/container/static_vector.hpp>
@@ -83,7 +84,7 @@ public:
     void EmitVerboseDebuggingOutput(BlockOfCode* code, size_t host_loc_index) const noexcept;
 private:
 //non trivial
-    std::vector<IR::Inst*> values; //24
+    boost::container::small_vector<IR::Inst*, 3> values; //24
     // Block state
     uint16_t total_uses = 0; //8
     //sometimes zeroed
@@ -96,7 +97,7 @@ private:
     uint8_t max_bit_width = 0; //Valid values: 1,2,4,8,16,32,128
     bool is_scratch : 1 = false; //1
     bool is_set_last_use : 1 = false; //1
-    alignas(16) uint8_t lru_counter = 0; //1
+    uint8_t lru_counter = 0; //1
     friend class RegAlloc;
 };
 static_assert(sizeof(HostLocInfo) == 64);