Introduce FrameAndConstantPoolScope and ConstantPoolUnavailableScope.

src/arm/assembler-arm.cc

Index: src/arm/assembler-arm.cc
diff --git a/src/arm/assembler-arm.cc b/src/arm/assembler-arm.cc
index 35279e557c8a99d8daccf713b4c3be4e1892d8a9..77c98b469f4795ed22e2713ab1100fc64cf8cda7 100644
--- a/src/arm/assembler-arm.cc
+++ b/src/arm/assembler-arm.cc
@@ -525,6 +525,8 @@ Assembler::Assembler(Isolate* isolate, void* buffer, int buffer_size)
   first_const_pool_32_use_ = -1;
   first_const_pool_64_use_ = -1;
   last_bound_pos_ = 0;
+  constant_pool_available_ = !FLAG_enable_ool_constant_pool;
+  constant_pool_full_ = false;
   ClearRecordedAstId();
 }