Shorten bail out checks when calling code which can fail.

src/x64/stub-cache-x64.cc

Index: src/x64/stub-cache-x64.cc
diff --git a/src/x64/stub-cache-x64.cc b/src/x64/stub-cache-x64.cc
index 620f2098d1a2a1f741f110a1712230fa354f0947..d57940c1380ed5838278a5bd40aefedbb44e01f7 100644
--- a/src/x64/stub-cache-x64.cc
+++ b/src/x64/stub-cache-x64.cc
@@ -1372,10 +1372,8 @@ MaybeObject* CallStubCompiler::CompileCallField(JSObject* object,
 
   // Handle call cache miss.
   __ bind(&miss);
-  Object* obj;
-  { MaybeObject* maybe_obj = GenerateMissBranch();
-    if (!maybe_obj->ToObject(&obj)) return maybe_obj;
-  }
+  MaybeObject* maybe_result = GenerateMissBranch();
+  if (maybe_result->IsFailure()) return maybe_result;
 
   // Return the generated code.
   return GetCode(FIELD, name);
@@ -1535,10 +1533,8 @@ MaybeObject* CallStubCompiler::CompileArrayPushCall(Object* object,
   }
 
   __ bind(&miss);
-  Object* obj;
-  { MaybeObject* maybe_obj = GenerateMissBranch();
-    if (!maybe_obj->ToObject(&obj)) return maybe_obj;
-  }
+  MaybeObject* maybe_result = GenerateMissBranch();
+  if (maybe_result->IsFailure()) return maybe_result;
 
   // Return the generated code.
   return GetCode(function);
@@ -1619,10 +1615,8 @@ MaybeObject* CallStubCompiler::CompileArrayPopCall(Object* object,
                                1);
 
   __ bind(&miss);
-  Object* obj;
-  { MaybeObject* maybe_obj = GenerateMissBranch();
-    if (!maybe_obj->ToObject(&obj)) return maybe_obj;
-  }
+  MaybeObject* maybe_result = GenerateMissBranch();
+  if (maybe_result->IsFailure()) return maybe_result;
 
   // Return the generated code.
   return GetCode(function);
@@ -1703,10 +1697,8 @@ MaybeObject* CallStubCompiler::CompileStringCharCodeAtCall(
   // Restore function name in rcx.
   __ Move(rcx, Handle<String>(name));
   __ bind(&name_miss);
-  Object* obj;
-  { MaybeObject* maybe_obj = GenerateMissBranch();
-    if (!maybe_obj->ToObject(&obj)) return maybe_obj;
-  }
+  MaybeObject* maybe_result = GenerateMissBranch();
+  if (maybe_result->IsFailure()) return maybe_result;
 
   // Return the generated code.
   return GetCode(function);
@@ -1789,10 +1781,8 @@ MaybeObject* CallStubCompiler::CompileStringCharAtCall(
   // Restore function name in rcx.
   __ Move(rcx, Handle<String>(name));
   __ bind(&name_miss);
-  Object* obj;
-  { MaybeObject* maybe_obj = GenerateMissBranch();
-    if (!maybe_obj->ToObject(&obj)) return maybe_obj;
-  }
+  MaybeObject* maybe_result = GenerateMissBranch();
+  if (maybe_result->IsFailure()) return maybe_result;
 
   // Return the generated code.
   return GetCode(function);
@@ -1860,10 +1850,8 @@ MaybeObject* CallStubCompiler::CompileStringFromCharCodeCall(
 
   __ bind(&miss);
   // rcx: function name.
-  Object* obj;
-  { MaybeObject* maybe_obj = GenerateMissBranch();
-    if (!maybe_obj->ToObject(&obj)) return maybe_obj;
-  }
+  MaybeObject* maybe_result = GenerateMissBranch();
+  if (maybe_result->IsFailure()) return maybe_result;
 
   // Return the generated code.
   return (cell == NULL) ? GetCode(function) : GetCode(NORMAL, name);
@@ -1975,10 +1963,8 @@ MaybeObject* CallStubCompiler::CompileMathAbsCall(Object* object,
 
   __ bind(&miss);
   // rcx: function name.
-  Object* obj;
-  { MaybeObject* maybe_obj = GenerateMissBranch();
-    if (!maybe_obj->ToObject(&obj)) return maybe_obj;
-  }
+  MaybeObject* maybe_result = GenerateMissBranch();
+  if (maybe_result->IsFailure()) return maybe_result;
 
   // Return the generated code.
   return (cell == NULL) ? GetCode(function) : GetCode(NORMAL, name);
@@ -2034,10 +2020,8 @@ MaybeObject* CallStubCompiler::CompileFastApiCall(
   __ addq(rsp, Immediate(kFastApiCallArguments * kPointerSize));
 
   __ bind(&miss_before_stack_reserved);
-  Object* obj;
-  { MaybeObject* maybe_obj = GenerateMissBranch();
-    if (!maybe_obj->ToObject(&obj)) return maybe_obj;
-  }
+  MaybeObject* maybe_result = GenerateMissBranch();
+  if (maybe_result->IsFailure()) return maybe_result;
 
   // Return the generated code.
   return GetCode(function);
@@ -2170,10 +2154,8 @@ MaybeObject* CallStubCompiler::CompileCallConstant(Object* object,
 
   // Handle call cache miss.
   __ bind(&miss);
-  Object* obj;
-  { MaybeObject* maybe_obj = GenerateMissBranch();
-    if (!maybe_obj->ToObject(&obj)) return maybe_obj;
-  }
+  MaybeObject* maybe_result = GenerateMissBranch();
+  if (maybe_result->IsFailure()) return maybe_result;
 
   // Return the generated code.
   return GetCode(function);
@@ -2239,10 +2221,8 @@ MaybeObject* CallStubCompiler::CompileCallInterceptor(JSObject* object,
 
   // Handle load cache miss.
   __ bind(&miss);
-  Object* obj;
-  { MaybeObject* maybe_obj = GenerateMissBranch();
-    if (!maybe_obj->ToObject(&obj)) return maybe_obj;
-  }
+  MaybeObject* maybe_result = GenerateMissBranch();
+  if (maybe_result->IsFailure()) return maybe_result;
 
   // Return the generated code.
   return GetCode(INTERCEPTOR, name);
@@ -2311,10 +2291,8 @@ MaybeObject* CallStubCompiler::CompileCallGlobal(JSObject* object,
   // Handle call cache miss.
   __ bind(&miss);
   __ IncrementCounter(COUNTERS->call_global_inline_miss(), 1);
-  Object* obj;
-  { MaybeObject* maybe_obj = GenerateMissBranch();
-    if (!maybe_obj->ToObject(&obj)) return maybe_obj;
-  }
+  MaybeObject* maybe_result = GenerateMissBranch();
+  if (maybe_result->IsFailure()) return maybe_result;
 
   // Return the generated code.
   return GetCode(NORMAL, name);