Revert "target: support spaces in target attribute."

This reverts commit df592811f9.

gcc/config/i386/i386-options.c

@@ -1146,8 +1146,6 @@ ix86_valid_target_attribute_inner_p (tree fndecl, tree args, char *p_strings[],
 	  next_optstr = NULL;
 	}
 
-      p = strip_whitespaces (p, &len);
-
       /* Recognize no-xxx.  */
       if (len > 3 && p[0] == 'n' && p[1] == 'o' && p[2] == '-')
 	{

gcc/system.h

@@ -1305,25 +1305,4 @@ startswith (const char *str, const char *prefix)
   return strncmp (str, prefix, strlen (prefix)) == 0;
 }
 
-/* Strip white spaces from STRING with LEN length.
-   A stripped string is returned and LEN is updated accordingly.  */
-
-static inline char *
-strip_whitespaces (char *string, size_t *len)
-{
-  while (string[0] == ' ' || string[0] == '\t')
-    {
-      --(*len);
-      ++string;
-    }
-
-  while (string[*len - 1] == ' ' || string[*len - 1] == '\t')
-    {
-      string[*len - 1] = '\0';
-      --(*len);
-    }
-
-  return string;
-}
-
 #endif /* ! GCC_SYSTEM_H */

gcc/testsuite/gcc.target/i386/pr102374.c

@@ -1,3 +0,0 @@
-/* PR target/102374 */
-
-void calculate_sse(void) __attribute__ ((__target__ ("	no-avx, sse2   ")));