[Interpreter] Ensure ValueOf is only called once for post-increment operations.

test/cctest/interpreter/bytecode_expectations/CountOperators.golden

Index: test/cctest/interpreter/bytecode_expectations/CountOperators.golden
diff --git a/test/cctest/interpreter/bytecode_expectations/CountOperators.golden b/test/cctest/interpreter/bytecode_expectations/CountOperators.golden
index 5683eb7a071a3a0319f62ddf5857dd78fa46df6a..b17f3ecf20a6a63d54f7f0c09d6d3fc1a5d0fa97 100644
--- a/test/cctest/interpreter/bytecode_expectations/CountOperators.golden
+++ b/test/cctest/interpreter/bytecode_expectations/CountOperators.golden
@@ -31,12 +31,13 @@ snippet: "
 "
 frame size: 2
 parameter count: 1
-bytecode array length: 14
+bytecode array length: 16
 bytecodes: [
   /*   30 E> */ B(StackCheck),
   /*   42 S> */ B(LdaSmi), U8(1),
                 B(Star), R(0),
   /*   45 S> */ B(ToNumber), R(1),
+                B(Ldar), R(1),
                 B(Inc), U8(2),
                 B(Star), R(0),
                 B(Ldar), R(1),
@@ -73,12 +74,13 @@ snippet: "
 "
 frame size: 2
 parameter count: 1
-bytecode array length: 14
+bytecode array length: 16
 bytecodes: [
   /*   30 E> */ B(StackCheck),
   /*   42 S> */ B(LdaSmi), U8(1),
                 B(Star), R(0),
   /*   45 S> */ B(ToNumber), R(1),
+                B(Ldar), R(1),
                 B(Dec), U8(2),
                 B(Star), R(0),
                 B(Ldar), R(1),
@@ -95,13 +97,14 @@ snippet: "
 "
 frame size: 3
 parameter count: 1
-bytecode array length: 24
+bytecode array length: 26
 bytecodes: [
   /*   30 E> */ B(StackCheck),
   /*   42 S> */ B(CreateObjectLiteral), U8(0), U8(0), U8(1), R(1),
                 B(Mov), R(1), R(0),
   /*   54 S> */ B(LdaNamedProperty), R(0), U8(1), U8(2),
                 B(ToNumber), R(2),
+                B(Ldar), R(2),
                 B(Inc), U8(6),
   /*   66 E> */ B(StaNamedPropertySloppy), R(0), U8(1), U8(4),
                 B(Ldar), R(2),
@@ -143,7 +146,7 @@ snippet: "
 "
 frame size: 5
 parameter count: 1
-bytecode array length: 29
+bytecode array length: 31
 bytecodes: [
   /*   30 E> */ B(StackCheck),
   /*   45 S> */ B(LdaConstant), U8(0),
@@ -153,6 +156,7 @@ bytecodes: [
   /*   72 S> */ B(Ldar), R(0),
   /*   81 E> */ B(LdaKeyedProperty), R(1), U8(2),
                 B(ToNumber), R(4),
+                B(Ldar), R(4),
                 B(Dec), U8(6),
   /*   86 E> */ B(StaKeyedPropertySloppy), R(1), R(0), U8(4),
                 B(Ldar), R(4),
@@ -223,7 +227,7 @@ snippet: "
 "
 frame size: 3
 parameter count: 1
-bytecode array length: 25
+bytecode array length: 27
 bytecodes: [
                 B(CreateFunctionContext), U8(1),
                 B(PushContext), R(1),
@@ -234,6 +238,7 @@ bytecodes: [
                 B(Star), R(0),
   /*   78 S> */ B(LdaCurrentContextSlot), U8(4),
                 B(ToNumber), R(2),
+                B(Ldar), R(2),
                 B(Dec), U8(2),
   /*   86 E> */ B(StaCurrentContextSlot), U8(4),
                 B(Ldar), R(2),
@@ -251,7 +256,7 @@ snippet: "
 "
 frame size: 4
 parameter count: 1
-bytecode array length: 26
+bytecode array length: 28
 bytecodes: [
   /*   30 E> */ B(StackCheck),
   /*   44 S> */ B(LdaSmi), U8(1),
@@ -260,6 +265,7 @@ bytecodes: [
                 B(Star), R(1),
   /*   63 S> */ B(Ldar), R(0),
                 B(ToNumber), R(3),
+                B(Ldar), R(3),
                 B(Inc), U8(2),
                 B(Star), R(0),
                 B(LdaSmi), U8(2),