[PATCH] Add CXXMethodDecl::getInlineBody() and fix cpp11-migrate segfault

[Guillaume Papin]

Hello,
Here are my first (small) patches:

1. Add `CXXMethodDecl::getInlineBody()`. `hasInlineBody()` already exists but
   not the getter(s). I'm not totally sure about the clarity of the
   documentation and note that `hasInlineBody()` is lacking one.

   This patch is then used by the second patch.

2. Fix of PR15827 (http://llvm.org/bugs/show_bug.cgi?id=15827). A test-case has
   been added as well. A comment in the PR notify of the absence of a check for
   the main file, this has also been fixed.

I hope everything looks good,
Regards.

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-- 
Guillaume Papin