Encode interpreter::SourcePositionTable as variable-length ints.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index fd330074aa910e556b05fb899aaa058d4eae4d7d..fecbcafd6694ee851d3887d13bb3798fd1897a8e 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -4055,10 +4055,9 @@ int BytecodeArray::parameter_count() const {
 
 ACCESSORS(BytecodeArray, constant_pool, FixedArray, kConstantPoolOffset)
 ACCESSORS(BytecodeArray, handler_table, FixedArray, kHandlerTableOffset)
-ACCESSORS(BytecodeArray, source_position_table, FixedArray,
+ACCESSORS(BytecodeArray, source_position_table, ByteArray,
           kSourcePositionTableOffset)
 
-
 Address BytecodeArray::GetFirstBytecodeAddress() {
   return reinterpret_cast<Address>(this) - kHeapObjectTag + kHeaderSize;
 }