gcc.dg/weak/typeof-2: arm may use constant pool

gcc.dg/weak/typeof-2: arm may use constant pool

Some ARM configurations, such as with -mlong-calls, load the call
target from the constant pool, breaking the expectation of the test as
on several other targets.

for  gcc/testsuite/ChangeLog

	* gcc.dg/weak/typeof-2.c: Add arm*-*-* to targets that may
	place the call target in a constant pool.