Introduce collective --harmony flag.

src/arm/full-codegen-arm.cc

Index: src/arm/full-codegen-arm.cc
diff --git a/src/arm/full-codegen-arm.cc b/src/arm/full-codegen-arm.cc
index 8e3c020e21f06b6a0baabeb3171f70933c280e35..353ce5b10646e2bd79319612be07a85bbc632b6c 100644
--- a/src/arm/full-codegen-arm.cc
+++ b/src/arm/full-codegen-arm.cc
@@ -2139,10 +2139,8 @@ void FullCodeGenerator::EmitResolvePossiblyDirectEval(ResolveEvalFlag flag,
   __ push(r1);
   // Push the strict mode flag. In harmony mode every eval call
   // is a strict mode eval call.
-  StrictModeFlag strict_mode = strict_mode_flag();
-  if (FLAG_harmony_block_scoping) {
-    strict_mode = kStrictMode;
-  }
+  StrictModeFlag strict_mode =
+      FLAG_harmony_scoping ? kStrictMode : strict_mode_flag();
   __ mov(r1, Operand(Smi::FromInt(strict_mode)));
   __ push(r1);