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Use __asm__ __volatile__ with gcc

Some version of clang refuse 'asm volatile'

Change-Id: I79d909ac8ae3c04b608f20c6f10fa79b7f9fc8e0

--- a/vp8/encoder/x86/quantize_ssse3.c

+++ b/vp8/encoder/x86/quantize_ssse3.c

@@ -27,7 +27,11 @@

 #else

 static int bsr(int mask) {

   int eob;

+#if defined(__GNUC__) && __GNUC__

+  __asm__ __volatile__("bsr %1, %0" : "=r" (eob) : "r" (mask) : "flags");

+#elif defined(__SUNPRO_C) || defined(__SUNPRO_CC)

   asm volatile("bsr %1, %0" : "=r" (eob) : "r" (mask) : "flags");

+#endif

   eob++;

   if (mask == 0)

     eob = 0;