Add -Wstring-plus-char, which warns when adding char literals to C strings.

Specifically, this warns when a character literal is added (using '+') to a
variable with type 'char *' (or any other pointer to character type). Like
-Wstring-plus-int, there is a fix-it to change "foo + 'a'" to "&foo['a']"
iff the character literal is on the right side of the string.

Patch by Anders Rönnholm!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@193418 91177308-0d34-0410-b5e6-96231b3b80d8