New approach to Crankshaft decision-making

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 17289e8f0ac54c9b166f04b4abefbf4eae3f22ae..d787c79ba3e34d201f79099a4c2459a113e66cc3 100644
--- a/src/arm/full-codegen-arm.cc
+++ b/src/arm/full-codegen-arm.cc
@@ -139,6 +139,24 @@ void FullCodeGenerator::Generate(CompilationInfo* info) {
   }
 #endif
 
+  // Primitive functions are unlikely to be picked up by the stack-walking
+  // profiler, so they trigger their own optimization when they're called
+  // for the SharedFunctionInfo::kCallsUntilPrimitiveOptimization-th time.
+  if (info->function()->is_primitive() &&
+      !info->shared_info().is_null() &&
+      FLAG_crankshaft) {
+    info->shared_info()->set_call_counter(
+        SharedFunctionInfo::kCallsUntilPrimitiveOptimization);
+    __ mov(r2, Operand(info->shared_info()));
+    // r2: shared function info
+    __ ldr(r3, FieldMemOperand(r2, SharedFunctionInfo::kCallCounterOffset));
+    __ sub(r3, r3, Operand(Smi::FromInt(1)), SetCC);
+    __ str(r3, FieldMemOperand(r2, SharedFunctionInfo::kCallCounterOffset));
+    Handle<Code> compile_stub(
+        isolate()->builtins()->builtin(Builtins::kLazyRecompile));
+    __ Jump(compile_stub, RelocInfo::CODE_TARGET, eq);
+  }
+
   // Strict mode functions and builtins need to replace the receiver
   // with undefined when called as functions (without an explicit
   // receiver object). r5 is zero for method calls and non-zero for