target: Support whitespaces in target attr/pragma.

PR target/102375

gcc/ChangeLog:

	* config/aarch64/aarch64.c (aarch64_process_one_target_attr):
	Strip whitespaces.

gcc/testsuite/ChangeLog:

	* gcc.target/aarch64/pr102375.c: New test.

gcc/config/aarch64/aarch64.c

@@ -17633,6 +17633,7 @@ aarch64_process_one_target_attr (char *arg_str)
 
   char *str_to_check = (char *) alloca (len + 1);
   strcpy (str_to_check, arg_str);
+  str_to_check = strip_whitespaces (str_to_check, &len);
 
   /* We have something like __attribute__ ((target ("+fp+nosimd"))).
      It is easier to detect and handle it explicitly here rather than going

gcc/testsuite/gcc.target/aarch64/pr102375.c

@@ -0,0 +1,4 @@
+/* PR target/102375 */
+/* { dg-do compile } */
+
+void calculate(void) __attribute__ ((target ("+sve, +sve2")));