[clang-tidy] Use hasLocalStorage() to identify unnecessary copy...

[clang-tidy] Use hasLocalStorage() to identify unnecessary copy initializations to exclude static local variables.

Summary: Since local static variables can outlive other local variables exclude them from the unnecessary copy initialization check.

Reviewers: alexfh

Patch by Felix Berger!

Differential Revision: http://reviews.llvm.org/D15822

llvm-svn: 256636