[asan] run-time part of the caller-callee coverage instrumentation

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@220975 91177308-0d34-0410-b5e6-96231b3b80d8
[asan] increase the initial buffer size in caller-callee dumper

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@220991 91177308-0d34-0410-b5e6-96231b3b80d8