Drop computed handler count and index from AST.

src/x64/full-codegen-x64.cc

Index: src/x64/full-codegen-x64.cc
diff --git a/src/x64/full-codegen-x64.cc b/src/x64/full-codegen-x64.cc
index 5ed18854dcb91ed695e67a43a81f683f1d8edcdd..f06eaa9384e0215b94118436004bbab583774304 100644
--- a/src/x64/full-codegen-x64.cc
+++ b/src/x64/full-codegen-x64.cc
@@ -93,10 +93,6 @@ class JumpPatchSite BASE_EMBEDDED {
 // frames-x64.h for its layout.
 void FullCodeGenerator::Generate() {
   CompilationInfo* info = info_;
-  handler_table_ =
-      Handle<HandlerTable>::cast(isolate()->factory()->NewFixedArray(
-          HandlerTable::LengthForRange(function()->handler_count()), TENURED));
-
   profiling_counter_ = isolate()->factory()->NewCell(
       Handle<Smi>(Smi::FromInt(FLAG_interrupt_budget), isolate()));
   SetFunctionPosition(function());
@@ -2160,7 +2156,8 @@ void FullCodeGenerator::VisitYield(Yield* expr) {
       // re-boxing.
       __ bind(&l_try);
       __ Pop(rax);                                       // result
-      EnterTryBlock(expr->index(), &l_catch);
+      int handler_index = NewHandlerTableEntry();
+      EnterTryBlock(handler_index, &l_catch);
       const int try_block_size = TryCatch::kElementCount * kPointerSize;
       __ Push(rax);                                      // result
       __ jmp(&l_suspend);
@@ -2170,7 +2167,7 @@ void FullCodeGenerator::VisitYield(Yield* expr) {
       const int generator_object_depth = kPointerSize + try_block_size;
       __ movp(rax, Operand(rsp, generator_object_depth));
       __ Push(rax);                                      // g
-      __ Push(Smi::FromInt(expr->index()));              // handler-index
+      __ Push(Smi::FromInt(handler_index));              // handler-index
       DCHECK(l_continuation.pos() > 0 && Smi::IsValid(l_continuation.pos()));
       __ Move(FieldOperand(rax, JSGeneratorObject::kContinuationOffset),
               Smi::FromInt(l_continuation.pos()));
@@ -2184,7 +2181,7 @@ void FullCodeGenerator::VisitYield(Yield* expr) {
       __ Pop(rax);                                       // result
       EmitReturnSequence();
       __ bind(&l_resume);                                // received in rax
-      ExitTryBlock(expr->index());
+      ExitTryBlock(handler_index);
 
       // receiver = iter; f = 'next'; arg = received;
       __ bind(&l_next);