Don't warn for empty 'if' body if there is a macro that expands to nothing, e.g:

  if (condition)
    CALL(0); // empty macro but don't warn for empty body.

Fixes rdar://8436021.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@119838 91177308-0d34-0410-b5e6-96231b3b80d8
12 files changed