Use one offsets table per generated irregexp matching function.

runtime/vm/regexp.cc

Index: runtime/vm/regexp.cc
diff --git a/runtime/vm/regexp.cc b/runtime/vm/regexp.cc
index 4e556dcbb747d93e908e6d7150192db747fde542..87cf7bd8a264f457d0b4df692c74c5d1d9d825b4 100644
--- a/runtime/vm/regexp.cc
+++ b/runtime/vm/regexp.cc
@@ -410,8 +410,7 @@ RegExpEngine::CompilationResult RegExpCompiler::Assemble(
 
   macro_assembler->FinalizeIndirectGotos();
 
-  return RegExpEngine::CompilationResult(macro_assembler,
-                                         macro_assembler->graph_entry(),
+  return RegExpEngine::CompilationResult(macro_assembler->graph_entry(),
                                          macro_assembler->num_blocks(),
                                          macro_assembler->num_stack_locals());
 }