[ASan] Also print <empty stack> when size==0

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@195955 91177308-0d34-0410-b5e6-96231b3b80d8
Fix current stack unwinding when using DRASan

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@195956 91177308-0d34-0410-b5e6-96231b3b80d8
Increase the LocatePcInTrace PC threshold now that GET_STACK_TRACE_WITH_PC_AND_BP has grown

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@195957 91177308-0d34-0410-b5e6-96231b3b80d8
[sanitizer] disable shmctl intercetor in 32-bit -- it is rotten (bug filed)

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@195958 91177308-0d34-0410-b5e6-96231b3b80d8
[asan] dump coverage even if asan has reported an error 

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@195959 91177308-0d34-0410-b5e6-96231b3b80d8