[wasm] Fix binary search for asm.js offsets

src/wasm/wasm-debug.cc

 // Copyright 2016 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/wasm/wasm-debug.h"
 
 #include "src/assert-scope.h"
 #include "src/debug/debug.h"
 #include "src/factory.h"
 #include "src/isolate.h"
@@ skipping 285 matching lines @@
 
   DCHECK_LT(func_index, offset_tables->length());
   ByteArray *offset_table = ByteArray::cast(offset_tables->get(func_index));
 
   // Binary search for the current byte offset.
   int left = 0;                                       // inclusive
   int right = offset_table->length() / kIntSize / 2;  // exclusive
   DCHECK_LT(left, right);
   while (right - left > 1) {
     int mid = left + (right - left) / 2;
-    if (offset_table->get_int(2 * mid) < byte_offset) {
+    if (offset_table->get_int(2 * mid) <= byte_offset) {
       left = mid;
     } else {
       right = mid;
     }
   }
   // There should be an entry for each position that could show up on the stack
   // trace:
   DCHECK_EQ(byte_offset, offset_table->get_int(2 * left));
   return offset_table->get_int(2 * left + 1);
 }