Revert r11420 because Win32 compilation was broken.

src/compiler-intrinsics.h

Index: src/compiler-intrinsics.h
===================================================================
--- src/compiler-intrinsics.h	(revision 11420)
+++ src/compiler-intrinsics.h	(working copy)
@@ -40,9 +40,6 @@
   // Returns number of zero bits following most significant 1 bit.
   // Undefined for zero value.
   INLINE(static int CountLeadingZeros(uint32_t value));
-
-  // Returns the number of bits set.
-  INLINE(static int CountSetBits(uint32_t value));
 };
 
 #ifdef __GNUC__
@@ -54,10 +51,6 @@
   return __builtin_clz(value);
 }
 
-int CompilerIntrinsics::CountSetBits(uint32_t value) {
-  return __builtin_popcount(value);
-}
-
 #elif defined(_MSC_VER)
 
 #pragma intrinsic(_BitScanForward)
@@ -75,10 +68,6 @@
   return 31 - static_cast<int>(result);
 }
 
-int CompilerIntrinsics::CountSetBits(uint32_t value) {
-  return __popcnt(value);
-}
-
 #else
 #error Unsupported compiler
 #endif