Fix BitCount intrinsics assertions.

Bug: 27852035
Change-Id: Iba43039aadd9ba288b476d53cc2306a58356465f
diff --git a/compiler/optimizing/intrinsics_x86_64.cc b/compiler/optimizing/intrinsics_x86_64.cc
index 9e568f7..9ca4ef0 100644
--- a/compiler/optimizing/intrinsics_x86_64.cc
+++ b/compiler/optimizing/intrinsics_x86_64.cc
@@ -2402,10 +2402,10 @@
   if (invoke->InputAt(0)->IsConstant()) {
     // Evaluate this at compile time.
     int64_t value = Int64FromConstant(invoke->InputAt(0)->AsConstant());
-    value = is_long
+    int32_t result = is_long
         ? POPCOUNT(static_cast<uint64_t>(value))
         : POPCOUNT(static_cast<uint32_t>(value));
-    codegen->Load32BitValue(out, value);
+    codegen->Load32BitValue(out, result);
     return;
   }