[interpreter] Bytecode register optimizer.

test/cctest/interpreter/bytecode_expectations/CreateRestParameter.golden

Index: test/cctest/interpreter/bytecode_expectations/CreateRestParameter.golden
diff --git a/test/cctest/interpreter/bytecode_expectations/CreateRestParameter.golden b/test/cctest/interpreter/bytecode_expectations/CreateRestParameter.golden
index 341ad9cbf225a90c99c6a8b79ff070114ea907d3..daf976b264816ba99bfe39aaaff37e4272714bdd 100644
--- a/test/cctest/interpreter/bytecode_expectations/CreateRestParameter.golden
+++ b/test/cctest/interpreter/bytecode_expectations/CreateRestParameter.golden
@@ -35,15 +35,14 @@ snippet: "
 "
 frame size: 2
 parameter count: 2
-bytecode array length: 14
+bytecode array length: 13
 bytecodes: [
                 B(CreateRestParameter),
                 B(Star), R(0),
                 B(LdaTheHole),
                 B(Star), R(1),
   /*   10 E> */ B(StackCheck),
-                B(Ldar), R(arg0),
-                B(Star), R(1),
+                B(Mov), R(arg0), R(1),
   /*   29 S> */ B(Ldar), R(0),
   /*   46 S> */ B(Return),
 ]
@@ -57,21 +56,18 @@ snippet: "
   function f(a, ...restArgs) { return restArgs[0]; }
   f();
 "
-frame size: 3
+frame size: 2
 parameter count: 2
-bytecode array length: 20
+bytecode array length: 15
 bytecodes: [
                 B(CreateRestParameter),
                 B(Star), R(0),
                 B(LdaTheHole),
                 B(Star), R(1),
   /*   10 E> */ B(StackCheck),
-                B(Ldar), R(arg0),
-                B(Star), R(1),
-  /*   29 S> */ B(Ldar), R(0),
-                B(Star), R(2),
-  /*   44 E> */ B(LdaZero),
-                B(KeyedLoadIC), R(2), U8(1),
+                B(Mov), R(arg0), R(1),
+  /*   29 S> */ B(LdaZero),
+                B(KeyedLoadIC), R(0), U8(1),
   /*   49 S> */ B(Return),
 ]
 constant pool: [
@@ -86,7 +82,7 @@ snippet: "
 "
 frame size: 5
 parameter count: 2
-bytecode array length: 35
+bytecode array length: 26
 bytecodes: [
                 B(CreateUnmappedArguments),
                 B(Star), R(0),
@@ -95,17 +91,12 @@ bytecodes: [
                 B(LdaTheHole),
                 B(Star), R(2),
   /*   10 E> */ B(StackCheck),
-                B(Ldar), R(arg0),
-                B(Star), R(2),
-  /*   29 S> */ B(Ldar), R(1),
-                B(Star), R(3),
-  /*   44 E> */ B(LdaZero),
-                B(KeyedLoadIC), R(3), U8(1),
+                B(Mov), R(arg0), R(2),
+  /*   29 S> */ B(LdaZero),
+                B(KeyedLoadIC), R(1), U8(1),
                 B(Star), R(4),
-  /*   50 E> */ B(Ldar), R(0),
-                B(Star), R(3),
   /*   59 E> */ B(LdaZero),
-                B(KeyedLoadIC), R(3), U8(3),
+                B(KeyedLoadIC), R(0), U8(3),
                 B(Add), R(4),
   /*   64 S> */ B(Return),
 ]