swift234

[ClangImporter] Believe type info coming from integer literals in macros.

That is, 1234 is a CInt, 1234U is a CUnsignedInt, and 1234LL is a CLongLong.
Oh, and 3.14F is a CFloat.

One caveat here is that it is not actually possible in C to write a literal
INT_MIN:

  -0x80000000 is two tokens and the literal part is unsigned
  (-INT_MAX - 1) is several tokens

I've simply dropped this test for now, but it might be confusing in the rare
case where an INT_MIN-like value is used as a sentinel.

<rdar://problem/13839025>

Swift SVN r7639