remove memory constraint and fix definition.

Author: MalaySanghi

clang/lib/Headers/intrin.h

@@ -349,25 +349,22 @@ static inline unsigned long _inpd(unsigned short port) {
 }
 
 static inline int _outp(unsigned short port, int data) {
-  __asm__ volatile("outb %b0, %w1" : : "a"(data), "Nd"(port) : "memory");
+  __asm__ volatile("outb %b0, %w1" : : "a"(data), "Nd"(port));
   return data;
 }
 
 static inline unsigned short
 _outpw(unsigned short port, unsigned short data) {
-  __asm__ volatile("outw %w0, %w1" : : "a"(data), "Nd"(port) : "memory");
+  __asm__ volatile("outw %w0, %w1" : : "a"(data), "Nd"(port));
   return data;
 }
 
 static inline unsigned long _outpd(unsigned short port,
                                    unsigned long data) {
-  __asm__ volatile("outl %k0, %w1" : : "a"(data), "Nd"(port) : "memory");
+  __asm__ volatile("outl %k0, %w1" : : "a"(data), "Nd"(port));
   return data;
 }
 
-#endif
-
-#if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__)
 static __inline__ void __DEFAULT_FN_ATTRS __nop(void) {
   __asm__ volatile("nop");
 }