Fixed power-of-2 predicates, excluding 0.

src/arm64/macro-assembler-arm64-inl.h

Index: src/arm64/macro-assembler-arm64-inl.h
diff --git a/src/arm64/macro-assembler-arm64-inl.h b/src/arm64/macro-assembler-arm64-inl.h
index 4fd6d76c89f8186a9ce26edea1dbf1b9073a52c5..38b5d4b7518fc705f184ec38137f1c3004e8d650 100644
--- a/src/arm64/macro-assembler-arm64-inl.h
+++ b/src/arm64/macro-assembler-arm64-inl.h
@@ -1513,12 +1513,9 @@ void MacroAssembler::Claim(uint64_t count, uint64_t unit_size) {
 
 
 void MacroAssembler::Claim(const Register& count, uint64_t unit_size) {
+  if (unit_size == 0) return;
   ASSERT(IsPowerOf2(unit_size));
 
-  if (unit_size == 0) {
-    return;
-  }
-
   const int shift = CountTrailingZeros(unit_size, kXRegSizeInBits);
   const Operand size(count, LSL, shift);
 
@@ -1574,12 +1571,9 @@ void MacroAssembler::Drop(uint64_t count, uint64_t unit_size) {
 
 
 void MacroAssembler::Drop(const Register& count, uint64_t unit_size) {
+  if (unit_size == 0) return;
   ASSERT(IsPowerOf2(unit_size));
 
-  if (unit_size == 0) {
-    return;
-  }
-
   const int shift = CountTrailingZeros(unit_size, kXRegSizeInBits);
   const Operand size(count, LSL, shift);