New approach to Crankshaft decision-making

src/ia32/full-codegen-ia32.cc

Index: src/ia32/full-codegen-ia32.cc
diff --git a/src/ia32/full-codegen-ia32.cc b/src/ia32/full-codegen-ia32.cc
index 6e2391110b2346903d53b6d365fbe3d405afe3c1..7718714e88789038a2c2ae7212a87b3d00921780 100644
--- a/src/ia32/full-codegen-ia32.cc
+++ b/src/ia32/full-codegen-ia32.cc
@@ -129,6 +129,23 @@ 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 (FLAG_crankshaft &&
+      !info->shared_info().is_null() &&
+      info->function()->is_primitive()) {
+    info->shared_info()->set_call_counter(
+        SharedFunctionInfo::kCallsUntilPrimitiveOptimization);
+    __ mov(eax, Immediate(info->shared_info()));
+    // eax: shared function info
+    __ sub(FieldOperand(eax, SharedFunctionInfo::kCallCounterOffset),
+           Immediate(Smi::FromInt(1)));
+    Handle<Code> compile_stub(
+        isolate()->builtins()->builtin(Builtins::kLazyRecompile));
+    __ j(zero, compile_stub);
+  }
+
   // Strict mode functions and builtins need to replace the receiver
   // with undefined when called as functions (without an explicit
   // receiver object). ecx is zero for method calls and non-zero for