Reapply r151317, but when computing the PathDiagnostic profile and size keep into account the nested structure.  Also fix a problem with how
inlining impacted Plist diagnostics, and adjust some ranges in the Plist output due to richer information.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@151346 91177308-0d34-0410-b5e6-96231b3b80d8
8 files changed