PNaCl ABI checker: Reject integer arguments smaller than i32

We can simplify the varargs checks by doing the checking on the
FunctionType rather than having separate checks for the Function and
the CallInst.  (We couldn't do that prior to enabling
ReplacePtrsWithInts because at that point the IR contained bitcasts to
and from varargs FunctionTypes.)

That simplification means we can also add the check for
argument/return types in a single place too.

BUG=https://code.google.com/p/nativeclient/issues/detail?id=3342
TEST=*.ll tests + PNaCl toolchain trybots + GCC torture tests + LLVM test suite

Review URL: https://codereview.chromium.org/15899011

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