[interpreter] Bytecode register optimizer.

test/cctest/interpreter/bytecode_expectations/CountOperators.golden

 #
 # Autogenerated by generate-bytecode-expectations.
 #
 
 ---
 pool type: mixed
 execute: yes
 wrap: yes
 
 ---
@@ skipping 81 matching lines @@
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   var a = { val: 1 }; return a.val++;
 "
 frame size: 3
 parameter count: 1
-bytecode array length: 26
+bytecode array length: 24
 bytecodes: [
   /*   30 E> */ B(StackCheck),
   /*   42 S> */ B(CreateObjectLiteral), U8(0), U8(0), U8(1),
                 B(Star), R(1),
                 B(Star), R(0),
-  /*   54 S> */ B(Star), R(1),
-                B(LdaNamedProperty), R(1), U8(1), U8(1),
+  /*   54 S> */ B(LdaNamedProperty), R(0), U8(1), U8(1),
                 B(ToNumber),
                 B(Star), R(2),
                 B(Inc),
-  /*   66 E> */ B(StaNamedPropertySloppy), R(1), U8(1), U8(3),
+  /*   66 E> */ B(StaNamedPropertySloppy), R(0), U8(1), U8(3),
                 B(Ldar), R(2),
   /*   70 S> */ B(Return),
 ]
 constant pool: [
   InstanceType::FIXED_ARRAY_TYPE,
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   var a = { val: 1 }; return --a.val;
 "
 frame size: 2
 parameter count: 1
-bytecode array length: 21
+bytecode array length: 19
 bytecodes: [
   /*   30 E> */ B(StackCheck),
   /*   42 S> */ B(CreateObjectLiteral), U8(0), U8(0), U8(1),
                 B(Star), R(1),
                 B(Star), R(0),
-  /*   54 S> */ B(Star), R(1),
-                B(LdaNamedProperty), R(1), U8(1), U8(1),
+  /*   54 S> */ B(LdaNamedProperty), R(0), U8(1), U8(1),
                 B(Dec),
-  /*   65 E> */ B(StaNamedPropertySloppy), R(1), U8(1), U8(3),
+  /*   65 E> */ B(StaNamedPropertySloppy), R(0), U8(1), U8(3),
   /*   70 S> */ B(Return),
 ]
 constant pool: [
   InstanceType::FIXED_ARRAY_TYPE,
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   var name = 'var'; var a = { val: 1 }; return a[name]--;
 "
 frame size: 5
 parameter count: 1
-bytecode array length: 33
+bytecode array length: 30
 bytecodes: [
   /*   30 E> */ B(StackCheck),
   /*   45 S> */ B(LdaConstant), U8(0),
                 B(Star), R(0),
   /*   60 S> */ B(CreateObjectLiteral), U8(1), U8(0), U8(1),
                 B(Star), R(2),
                 B(Star), R(1),
-  /*   72 S> */ B(Star), R(2),
+  /*   72 S> */ B(Nop),
   /*   81 E> */ B(Ldar), R(0),
-                B(Star), R(3),
-                B(LdaKeyedProperty), R(2), U8(1),
+                B(LdaKeyedProperty), R(1), U8(1),
                 B(ToNumber),
                 B(Star), R(4),
                 B(Dec),
-  /*   86 E> */ B(StaKeyedPropertySloppy), R(2), R(3), U8(3),
+  /*   86 E> */ B(StaKeyedPropertySloppy), R(1), R(0), U8(3),
                 B(Ldar), R(4),
   /*   90 S> */ B(Return),
 ]
 constant pool: [
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
   InstanceType::FIXED_ARRAY_TYPE,
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   var name = 'var'; var a = { val: 1 }; return ++a[name];
 "
-frame size: 4
+frame size: 3
 parameter count: 1
-bytecode array length: 28
+bytecode array length: 25
 bytecodes: [
   /*   30 E> */ B(StackCheck),
   /*   45 S> */ B(LdaConstant), U8(0),
                 B(Star), R(0),
   /*   60 S> */ B(CreateObjectLiteral), U8(1), U8(0), U8(1),
                 B(Star), R(2),
                 B(Star), R(1),
-  /*   72 S> */ B(Star), R(2),
+  /*   72 S> */ B(Nop),
   /*   83 E> */ B(Ldar), R(0),
-                B(Star), R(3),
-                B(LdaKeyedProperty), R(2), U8(1),
+                B(LdaKeyedProperty), R(1), U8(1),
                 B(Inc),
-  /*   87 E> */ B(StaKeyedPropertySloppy), R(2), R(3), U8(3),
+  /*   87 E> */ B(StaKeyedPropertySloppy), R(1), R(0), U8(3),
   /*   90 S> */ B(Return),
 ]
 constant pool: [
   InstanceType::ONE_BYTE_INTERNALIZED_STRING_TYPE,
   InstanceType::FIXED_ARRAY_TYPE,
 ]
 handlers: [
 ]
 
 ---
@@ skipping 50 matching lines @@
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   var idx = 1; var a = [1, 2]; return a[idx++] = 2;
 "
 frame size: 4
 parameter count: 1
-bytecode array length: 28
+bytecode array length: 26
 bytecodes: [
   /*   30 E> */ B(StackCheck),
   /*   44 S> */ B(LdaSmi), U8(1),
                 B(Star), R(0),
   /*   55 S> */ B(CreateArrayLiteral), U8(0), U8(0), U8(3),
                 B(Star), R(1),
-  /*   63 S> */ B(Star), R(2),
-                B(Ldar), R(0),
+  /*   63 S> */ B(Ldar), R(0),
                 B(ToNumber),
                 B(Star), R(3),
                 B(Inc),
   /*   75 E> */ B(Star), R(0),
                 B(LdaSmi), U8(2),
-  /*   79 E> */ B(StaKeyedPropertySloppy), R(2), R(3), U8(1),
+  /*   79 E> */ B(StaKeyedPropertySloppy), R(1), R(3), U8(1),
   /*   84 S> */ B(Return),
 ]
 constant pool: [
   InstanceType::FIXED_ARRAY_TYPE,
 ]
 handlers: [
 ]