ARM64: Enable shorten-64-to-32 warning

src/base/bits.h

Index: src/base/bits.h
diff --git a/src/base/bits.h b/src/base/bits.h
index 5c7cd74c610d5f8f59b21214d888d2b284825935..b237d62bcb1d6f47500a42ffe76bef510e2006d6 100644
--- a/src/base/bits.h
+++ b/src/base/bits.h
@@ -44,6 +44,17 @@ inline unsigned CountPopulation64(uint64_t value) {
 }
 
 
+// Overloaded versions of CountPopulation32/64.
+inline unsigned CountPopulation(uint32_t value) {
+  return CountPopulation32(value);
+}
+
+
+inline unsigned CountPopulation(uint64_t value) {
+  return CountPopulation64(value);
+}
+
+
 // CountLeadingZeros32(value) returns the number of zero bits following the most
 // significant 1 bit in |value| if |value| is non-zero, otherwise it returns 32.
 inline unsigned CountLeadingZeros32(uint32_t value) {