[PATCH] Fix for Bug 19785 : -Wempty-body false negative on NULL check

[Manasij Mukherjee]

Hi,
This patch fixes bug 19785 and adds a new test case for the problem.
https://llvm.org/bugs/show_bug.cgi?id=19785

In a case like:
if ( ptr == NULL );
the check used to consider the definition location of NULL, instead of the
current line.

(This is the first time I am attaching a patch, please inform me if I do
something wrong)
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