ARM: build fix for r19380.

src/arm/code-stubs-arm.cc

Index: src/arm/code-stubs-arm.cc
diff --git a/src/arm/code-stubs-arm.cc b/src/arm/code-stubs-arm.cc
index 10818ce7026e3cb3fe19371cb10290d249932f5d..c9b479eaa19e71678dc4cab049d7772269323b77 100644
--- a/src/arm/code-stubs-arm.cc
+++ b/src/arm/code-stubs-arm.cc
@@ -5527,8 +5527,12 @@ void CallApiFunctionStub::Generate(MacroAssembler* masm) {
   MemOperand context_restore_operand(
       fp, (2 + FCA::kContextSaveIndex) * kPointerSize);
   // Stores return the first js argument
-  int return_value_offset =
-      2 + (is_store ? FCA::kArgsLength : FCA::kReturnValueOffset);
+  int return_value_offset = 0;
+  if (is_store) {
+    return_value_offset = 2 + FCA::kArgsLength;
+  } else {
+    return_value_offset = 2 + FCA::kReturnValueOffset;
+  }
   MemOperand return_value_operand(fp, return_value_offset * kPointerSize);
 
   __ CallApiFunctionAndReturn(api_function_address,