Expose the bytecode limit for optimization as a flag

Bug: v8:9119, v8:8598
Change-Id: Ia4765c19e60b58d938fe778776ee654b60631e39
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1564203
Commit-Queue: Jaroslav Sevcik <jarin@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60808}

src/compiler/pipeline.cc

@@ -94,11 +94,6 @@ namespace v8 {
 namespace internal {
 namespace compiler {
 
-// TurboFan can only handle 2^16 control inputs. Since each control flow split
-// requires at least two bytes (jump and offset), we limit the bytecode size
-// to 60KiB bytes.
-const int kMaxBytecodeSizeForTurbofan = 60 * KB;
-
 class PipelineData {
  public:
   // For main entry point.
@@ -924,7 +919,7 @@ PipelineCompilationJob::Status PipelineCompilationJob::PrepareJobImpl(
       this, TRACE_EVENT_FLAG_FLOW_IN | TRACE_EVENT_FLAG_FLOW_OUT, "function",
       compilation_info()->shared_info()->TraceIDRef());
   if (compilation_info()->bytecode_array()->length() >
-      kMaxBytecodeSizeForTurbofan) {
+      FLAG_max_optimized_bytecode_size) {
     return AbortOptimization(BailoutReason::kFunctionTooBig);
   }
 

src/flag-definitions.h

@@ -500,6 +500,10 @@ DEFINE_FLOAT(reserve_inline_budget_scale_factor, 1.2,
              "maximum cumulative size of bytecode considered for inlining")
 DEFINE_INT(max_inlined_bytecode_size_small, 30,
            "maximum size of bytecode considered for small function inlining")
+DEFINE_INT(max_optimized_bytecode_size, 60 * KB,
+           "maximum bytecode size to "
+           "be considered for optimization; too high values may cause "
+           "the compiler to hit (release) assertions")
 DEFINE_FLOAT(min_inlining_frequency, 0.15, "minimum frequency for inlining")
 DEFINE_BOOL(polymorphic_inlining, true, "polymorphic inlining")
 DEFINE_BOOL(stress_inline, false,