Fix windows buildbots building llvm-xray

2 issues:
1 - replaced unix-style pid_t with cross-platform llvm::sys::ProcessInfo::ProcessId 
2 - fixed shadow variable warning in lambda expression

Reviewed by @filcab

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@291760 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed