Enable background compilation of regexp methods. Regexp functions may use indirect goto instruction…

runtime/vm/intermediate_language_ia32.cc

Index: runtime/vm/intermediate_language_ia32.cc
diff --git a/runtime/vm/intermediate_language_ia32.cc b/runtime/vm/intermediate_language_ia32.cc
index e4fcd9d101a84ee15cea2a10de2a4725fdf81ed8..bd83626ec97c8d45599c46aeac729e98827fd903 100644
--- a/runtime/vm/intermediate_language_ia32.cc
+++ b/runtime/vm/intermediate_language_ia32.cc
@@ -6561,8 +6561,11 @@ void IndirectGotoInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
 
   // Load code object from frame.
   __ movl(target_reg, Address(EBP, kPcMarkerSlotFromFp * kWordSize));
-  // Load instructions entry point.
-  __ movl(target_reg, FieldAddress(target_reg, Code::entry_point_offset()));
+  // Load instructions object (active_instructions and Code::entry_point() may
+  // not point to this instruction object any more; see Code::DisableDartCode).
+  __ movl(target_reg,
+      FieldAddress(target_reg, Code::saved_instructions_offset()));
+  __ addl(target_reg, Immediate(Instructions::HeaderSize() - kHeapObjectTag));
 
   // Add the offset.
   Register offset_reg = locs()->in(0).reg();