8146984: SIGBUS: bool Method::has_method_vptr(const void*)+0xc Summary: Add address check and use SafeFetchN for Method* vptr access when Method* may be bad pointer. Reviewed-by: dcubed, mgronlun

^build/
^dist/
nbproject/private/
^webrev
^.hgtip
^.bridge2
^.jib/
.DS_Store
.metadata/
.recommenders/