[PATCH] Add standard insert overloads to StringMap

[Agustín Bergé]

Changes in this iteration:

- Removed extra variable in `insert`.
- Removed unwanted changes from clang-format.
- Added a test case (attempt) for insertion where rehashing happens, and the bucket pointing to the element changes. This is a bad test, but I'm including it as a base for discussion on how should such a test look, if it's even sensible to have it.

http://reviews.llvm.org/D4153

Files:
  include/llvm/ADT/StringMap.h
  lib/Support/StringMap.cpp
  unittests/ADT/StringMapTest.cpp
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