[clang-tidy] make readability-redundant-smartptr-get report get() usage in conditions
This patch extends clang-tidy's readability-redundant-smartptr-get to produce
warnings for previously unsupported cases:
```
std::unique_ptr<void> ptr;
if (ptr.get())
if (ptr.get() == NULL)
if (ptr.get() != NULL)
```
This is intended to fix https://llvm.org/bugs/show_bug.cgi?id=25804, a bug
report opened by @Eugene.Zelenko.
However, there still are cases not detected by the check. They can be found in
`void Negative()` function defined in
test/clang-tidy/readability-redundant-smartptr-get.cpp.
Reviewers: alexfh
Differential Revision: https://reviews.llvm.org/D24893
llvm-svn: 282386