[SPARC] Fix types of size_t, intptr_t, and ptrdiff_t on Linux.

[SPARC] Fix types of size_t, intptr_t, and ptrdiff_t on Linux.

They should be 'int' instead of 'long int' everywhere else except
NetBSD too, from what I gather in GCC's spec files. So, optimistically
changing it for everyone else, too.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@239046 91177308-0d34-0410-b5e6-96231b3b80d8