Heap::AllocateStringFromOneByte() and major part of its callers handlified.

tools/lexer-shell.cc

Index: tools/lexer-shell.cc
diff --git a/tools/lexer-shell.cc b/tools/lexer-shell.cc
index e2e4a9c2521f55a4074214afe82492c2096d4031..273cdd9f4d7a49d6cffa9b5b7788ddad4f4ccd77 100644
--- a/tools/lexer-shell.cc
+++ b/tools/lexer-shell.cc
@@ -67,16 +67,14 @@ class BaselineScanner {
         Handle<String> result = isolate->factory()->NewStringFromTwoByte(
             Vector<const uint16_t>(
                 reinterpret_cast<const uint16_t*>(source_),
-                length / 2));
-        CHECK_NOT_EMPTY_HANDLE(isolate, result);
+                length / 2)).ToHandleChecked();
         stream_ =
             new GenericStringUtf16CharacterStream(result, 0, result->length());
         break;
       }
       case LATIN1: {
         Handle<String> result = isolate->factory()->NewStringFromOneByte(
-            Vector<const uint8_t>(source_, length));
-        CHECK_NOT_EMPTY_HANDLE(isolate, result);
+            Vector<const uint8_t>(source_, length)).ToHandleChecked();
         stream_ =
             new GenericStringUtf16CharacterStream(result, 0, result->length());
         break;