[turbofan] Assign types to remaining builtins on String.prototype.

src/compiler/typer.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/typer.h"
 
 #include <iomanip>
 
 #include "src/base/flags.h"
 #include "src/bootstrapper.h"
@@ skipping 1351 matching lines @@
           return Type::Union(Type::Range(0.0, 999.0, t->zone()), Type::NaN(),
                              t->zone());
         case kDateGetMinutes:
           return t->cache_.kJSDateMinuteType;
         case kDateGetMonth:
           return t->cache_.kJSDateMonthType;
         case kDateGetSeconds:
           return t->cache_.kJSDateSecondType;
         case kDateGetTime:
           return t->cache_.kJSDateValueType;
+
         // Number functions.
         case kNumberIsFinite:
         case kNumberIsInteger:
         case kNumberIsNaN:
         case kNumberIsSafeInteger:
           return Type::Boolean();
         case kNumberParseFloat:
           return Type::Number();
         case kNumberParseInt:
           return t->cache_.kIntegerOrMinusZeroOrNaN;
         case kNumberToString:
           return Type::String();
+
         // String functions.
         case kStringCharCodeAt:
           return Type::Union(Type::Range(0, kMaxUInt16, t->zone()), Type::NaN(),
                              t->zone());
         case kStringCharAt:
+          return Type::String();
+        case kStringCodePointAt:
+          return Type::Union(Type::Range(0.0, String::kMaxCodePoint, t->zone()),
+                             Type::Undefined(), t->zone());
         case kStringConcat:
         case kStringFromCharCode:
+        case kStringFromCodePoint:
+          return Type::String();
+        case kStringIndexOf:
+        case kStringLastIndexOf:
+          return Type::Range(-1.0, String::kMaxLength - 1.0, t->zone());
+        case kStringEndsWith:
+        case kStringIncludes:
+          return Type::Boolean();
+        case kStringRaw:
+        case kStringRepeat:
+        case kStringSlice:
+          return Type::String();
+        case kStringStartsWith:
+          return Type::Boolean();
         case kStringSubstr:
+        case kStringSubstring:
         case kStringToLowerCase:
+        case kStringToString:
         case kStringToUpperCase:
+        case kStringTrim:
+        case kStringTrimLeft:
+        case kStringTrimRight:
+        case kStringValueOf:
           return Type::String();
 
         case kStringIterator:
         case kStringIteratorNext:
           return Type::OtherObject();
 
         case kArrayEntries:
         case kArrayKeys:
         case kArrayValues:
         case kTypedArrayEntries:
@@ skipping 373 matching lines @@
 Type* Typer::Visitor::TypeConstant(Handle<Object> value) {
   if (Type::IsInteger(*value)) {
     return Type::Range(value->Number(), value->Number(), zone());
   }
   return Type::NewConstant(value, zone());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8