[O] Optimize a lot of things

src/test/java/SpeedTest.kt

@@ -0,0 +1,14 @@
+import mars.Globals
+import mars.mips.hardware.MemoryConfigurations
+import kotlin.system.measureTimeMillis
+
+fun main(args: Array<String>)
+{
+    Globals.initialize(true)
+    MemoryConfigurations.setCurrentConfiguration(MemoryConfigurations.getDefaultConfiguration())
+    println(measureTimeMillis {
+        for (n in 0..100)
+            for (i in 0..128*256)
+                Globals.memory.getWord(0x10008000 + i * 4)
+    })
+}