Bump mmtk rev

Author: wks

mmtk/Cargo.lock

@@ -32,7 +32,7 @@ memoffset = "0.9.0"
 # - change branch
 # - change repo name
 # But other changes including adding/removing whitespaces in commented lines may break the CI.
-mmtk = { git = "https://github.com/wks/mmtk-core.git", rev = "7cb0b2c12be341c084e03f2cd943fad8ac088f83" }
+mmtk = { git = "https://github.com/wks/mmtk-core.git", rev = "eb1d8dfd8fd1bb41e618884052cab536c27d378d" }
 # Uncomment the following to build locally
 # mmtk = { path = "../repos/mmtk-core" }