Fix gcc.dg/ipa/inline-8.c for -fPIC

The problem here is with -fPIC, both cmp and move
don't bind locally so they are not even tried to be
inlined.  This fixes the issue by marking both
functions as static and now the testcase passes
for both -fPIC and -fno-PIC cases.

OK? Tested on x86_64-linux-gnu.

gcc/testsuite/ChangeLog:

	* gcc.dg/ipa/inline-8.c: Mark cmp and move as
	static so they both bind local and available for
	inlinine.

gcc/testsuite/gcc.dg/ipa/inline-8.c

@@ -6,13 +6,13 @@
 #include <math.h>
 extern int isnanf (float);
 /* Can't be inlined because isnanf will be optimized out.  */
-int
+static int
 cmp (float a)
 {
   return isnanf (a);
 }
 /* Can be inlined.  */
-int
+static int
 move (int a)
 {
   return a;