VectorICs: --print-ast now prints allocated vector slots

Looks like this:
--- AST ---
FUNC
. NAME "foo"
. INFERRED NAME ""
. RETURN
. . PROPERTY ICSlot(0, LOAD_IC)
. . . VAR PROXY ICSlot(1, LOAD_IC) (mode = DYNAMIC_GLOBAL) "a"
. . . NAME x

BUG=
R=rossberg@chromium.org

Review URL: https://codereview.chromium.org/1264823003

Cr-Commit-Position: refs/heads/master@{#29928}

src/prettyprinter.cc

@@ -419,6 +419,18 @@ void CallPrinter::PrintLiteral(const AstRawString* value, bool quote) {
 
 #ifdef DEBUG
 
+// A helper for ast nodes that use FeedbackVectorICSlots.
+static int FormatICSlotNode(Vector<char>* buf, Expression* node,
+                            const char* node_name, FeedbackVectorICSlot slot) {
+  int pos = SNPrintF(*buf, "%s", node_name);
+  if (!slot.IsInvalid()) {
+    const char* str = Code::Kind2String(node->FeedbackICSlotKind(0));
+    pos = SNPrintF(*buf + pos, " ICSlot(%d, %s)", slot.ToInt(), str);
+  }
+  return pos;
+}
+
+
 PrettyPrinter::PrettyPrinter(Isolate* isolate, Zone* zone) {
   output_ = NULL;
   size_ = 0;
@@ -1430,11 +1442,12 @@ void AstPrinter::VisitArrayLiteral(ArrayLiteral* node) {
 }
 
 
-// TODO(svenpanne) Start with IndentedScope.
 void AstPrinter::VisitVariableProxy(VariableProxy* node) {
   Variable* var = node->var();
   EmbeddedVector<char, 128> buf;
-  int pos = SNPrintF(buf, "VAR PROXY");
+  int pos =
+      FormatICSlotNode(&buf, node, "VAR PROXY", node->VariableFeedbackSlot());
+
   switch (var->location()) {
     case VariableLocation::UNALLOCATED:
       break;
@@ -1478,7 +1491,10 @@ void AstPrinter::VisitThrow(Throw* node) {
 
 
 void AstPrinter::VisitProperty(Property* node) {
-  IndentedScope indent(this, "PROPERTY");
+  EmbeddedVector<char, 128> buf;
+  FormatICSlotNode(&buf, node, "PROPERTY", node->PropertyFeedbackSlot());
+  IndentedScope indent(this, buf.start());
+
   Visit(node->obj());
   Literal* literal = node->key()->AsLiteral();
   if (literal != NULL && literal->value()->IsInternalizedString()) {
@@ -1490,7 +1506,10 @@ void AstPrinter::VisitProperty(Property* node) {
 
 
 void AstPrinter::VisitCall(Call* node) {
-  IndentedScope indent(this, "CALL");
+  EmbeddedVector<char, 128> buf;
+  FormatICSlotNode(&buf, node, "CALL", node->CallFeedbackICSlot());
+  IndentedScope indent(this, buf.start());
+
   Visit(node->expression());
   PrintArguments(node->arguments());
 }
@@ -1504,7 +1523,9 @@ void AstPrinter::VisitCallNew(CallNew* node) {
 
 
 void AstPrinter::VisitCallRuntime(CallRuntime* node) {
-  IndentedScope indent(this, "CALL RUNTIME");
+  EmbeddedVector<char, 128> buf;
+  FormatICSlotNode(&buf, node, "CALL RUNTIME", node->CallRuntimeFeedbackSlot());
+  IndentedScope indent(this, buf.start());
   PrintLiteralIndented("NAME", node->name(), false);
   PrintArguments(node->arguments());
 }