In Microsoft mode, force 64 bit hex integer constants to signed type if the LL...

In Microsoft mode, force 64 bit hex integer constants to signed type if the LL or i64 suffix is used. This MSVC behavior.

For example:

void f(long long){ printf("long long"); }
void f(unsigned long long) { printf("unsigned long long"); }
int main() {
   f(0xffffffffffffffffLL);
}
Will print "long long" using MSVC.

This patch also fixes 16 compile errors related to overloading issues when parsing the MSVC 2008 C++ standard lib.

llvm-svn: 123231