Revert "Use compiler intrinsic instead of assembly for popcnt"

This reverts commit a69f1d7c20.

src/Makefile

@@ -285,7 +285,7 @@ endif
 
 ### 3.9 popcnt
 ifeq ($(popcnt),yes)
-	CXXFLAGS += -msse4.2 -DUSE_POPCNT
+	CXXFLAGS += -msse3 -DUSE_POPCNT
 endif
 
 ### 3.10 pext

src/bitcount.h

@@ -96,7 +96,8 @@ inline int popcount<CNT_HW_POPCNT>(Bitboard b) {
 
 #else
 
-  return __builtin_popcountll(b);
+  __asm__("popcnt %1, %0" : "=r" (b) : "r" (b));
+  return b;
 
 #endif
 }