Update ImmixAllocator layout (#118)

* Add the field 'allow_slow_for_stress_test' to ImmixAllocator

Author: qinsoon

mmtk/Cargo.toml

@@ -20,7 +20,7 @@ lazy_static = "1.1"
 # - change branch
 # - change repo name
 # But other changes including adding/removing whitespaces in commented lines may break the CI.
-mmtk = { git = "https://github.com/mmtk/mmtk-core.git", rev = "0ededb3efad9d07d45844712aa46a8d402a8c73f" }
+mmtk = { git = "https://github.com/mmtk/mmtk-core.git", rev = "a08d13d7213a569d82d44b0107734861af9a3ad4" }
 # Uncomment the following to build locally
 # mmtk = { path = "../repos/mmtk-core" }
 

openjdk/mmtkMutator.hpp

@@ -54,6 +54,7 @@ struct ImmixAllocator {
   uint8_t _align[7];
   uint8_t line_opt_tag;
   uintptr_t line_opt;
+  uint8_t alloc_slow_for_stress;
 };
 
 struct MallocAllocator {