[interpreter] Bytecode register optimizer.

test/cctest/interpreter/bytecode_expectations/LogicalExpressions.golden

Index: test/cctest/interpreter/bytecode_expectations/LogicalExpressions.golden
diff --git a/test/cctest/interpreter/bytecode_expectations/LogicalExpressions.golden b/test/cctest/interpreter/bytecode_expectations/LogicalExpressions.golden
index fed8367212b4e9a1dc3402167e164c163a761f14..70aba1db81550c10c776b9167398a7f7f2580dfb 100644
--- a/test/cctest/interpreter/bytecode_expectations/LogicalExpressions.golden
+++ b/test/cctest/interpreter/bytecode_expectations/LogicalExpressions.golden
@@ -31,16 +31,15 @@ handlers: [
 snippet: "
   var x = 0; return (x == 1) || 3;
 "
-frame size: 2
+frame size: 1
 parameter count: 1
-bytecode array length: 15
+bytecode array length: 13
 bytecodes: [
   /*   30 E> */ B(StackCheck),
   /*   42 S> */ B(LdaZero),
   /*   42 E> */ B(Star), R(0),
-  /*   45 S> */ B(Star), R(1),
-                B(LdaSmi), U8(1),
-  /*   55 E> */ B(TestEqual), R(1),
+  /*   45 S> */ B(LdaSmi), U8(1),
+  /*   55 E> */ B(TestEqual), R(0),
                 B(JumpIfTrue), U8(4),
                 B(LdaSmi), U8(3),
   /*   67 S> */ B(Return),
@@ -74,16 +73,15 @@ handlers: [
 snippet: "
   var x = 0; return (x == 0) && 3;
 "
-frame size: 2
+frame size: 1
 parameter count: 1
-bytecode array length: 14
+bytecode array length: 12
 bytecodes: [
   /*   30 E> */ B(StackCheck),
   /*   42 S> */ B(LdaZero),
   /*   42 E> */ B(Star), R(0),
-  /*   45 S> */ B(Star), R(1),
-                B(LdaZero),
-  /*   55 E> */ B(TestEqual), R(1),
+  /*   45 S> */ B(LdaZero),
+  /*   55 E> */ B(TestEqual), R(0),
                 B(JumpIfFalse), U8(4),
                 B(LdaSmi), U8(3),
   /*   67 S> */ B(Return),
@@ -548,9 +546,9 @@ snippet: "
     a = 1, b = 2, 
     a = 1, b = 2, 3);
 "
-frame size: 4
+frame size: 3
 parameter count: 1
-bytecode array length: 282
+bytecode array length: 278
 bytecodes: [
   /*   30 E> */ B(StackCheck),
   /*   42 S> */ B(LdaSmi), U8(1),
@@ -559,10 +557,8 @@ bytecodes: [
   /*   53 E> */ B(Star), R(1),
   /*   60 S> */ B(LdaSmi), U8(3),
   /*   60 E> */ B(Star), R(2),
-  /*   63 S> */ B(Ldar), R(0),
-                B(Star), R(3),
-                B(LdaSmi), U8(3),
-  /*   73 E> */ B(TestGreaterThan), R(3),
+  /*   63 S> */ B(LdaSmi), U8(3),
+  /*   73 E> */ B(TestGreaterThan), R(0),
                 B(JumpIfTrueConstant), U8(0),
                 B(LdaSmi), U8(1),
   /*   87 E> */ B(Star), R(1),
@@ -737,9 +733,9 @@ snippet: "
     a = 1, b = 2, 
     a = 1, b = 2, 3);
 "
-frame size: 4
+frame size: 3
 parameter count: 1
-bytecode array length: 281
+bytecode array length: 277
 bytecodes: [
   /*   30 E> */ B(StackCheck),
   /*   42 S> */ B(LdaZero),
@@ -748,10 +744,8 @@ bytecodes: [
   /*   53 E> */ B(Star), R(1),
   /*   60 S> */ B(LdaSmi), U8(3),
   /*   60 E> */ B(Star), R(2),
-  /*   63 S> */ B(Ldar), R(0),
-                B(Star), R(3),
-                B(LdaSmi), U8(5),
-  /*   73 E> */ B(TestLessThan), R(3),
+  /*   63 S> */ B(LdaSmi), U8(5),
+  /*   73 E> */ B(TestLessThan), R(0),
                 B(JumpIfFalseConstant), U8(0),
                 B(LdaSmi), U8(1),
   /*   87 E> */ B(Star), R(1),