test cases for two bugs in cpplib

[Zack Weinberg]

Here are test cases for two bugs I found in cpplib (see egcs-patches
for fixes).  Can someone please add them to the testsuite?

zw

-- cpp-bug-1.c --
#define weak_alias(func, aliasname) \
	extern __typeof (func) aliasname __attribute__ ((weak, alias (#func)));

#define add3(d, m, c) ((d) + (m) + (c))

int
__add3(int d, int m, int c)
{
  return d + m + c;
}

weak_alias (__add3, add3)

-- cpp-bug-2.c --
#define P(a, b) P1(a,b)
#define P1(a,b) a##b

#define FLT_MIN_EXP (-125)
#define DBL_MIN_EXP (-1021)

#define MIN_EXP P(FLT,_MIN_EXP)

#define FLT FLT
int f1 = MIN_EXP;

#undef FLT
#define FLT DBL
int f2 = MIN_EXP;