[turbofan] Frame elision for code stubs

src/compiler/jump-threading.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/jump-threading.h"
 #include "src/compiler/code-generator-impl.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
@@ skipping 78 matching lines @@
           TRACE("  nop\n");
           continue;
         } else if (instr->arch_opcode() == kArchJmp) {
           // try to forward the jump instruction.
           TRACE("  jmp\n");
           // if this block deconstructs the frame, we can't forward it.
           // TODO(mtrofin): we can still forward if we end up building
           // the frame at start. So we should move the decision of whether
           // to build a frame or not in the register allocator, and trickle it
           // here and to the code generator.
-          if (frame_at_start || !block->must_deconstruct_frame()) {
+          if (frame_at_start ||
+              !(block->must_deconstruct_frame() ||
+                block->must_construct_frame())) {
             fw = code->InputRpo(instr, 0);
           }
           fallthru = false;
         } else {
           // can't skip other instructions.
           TRACE("  other\n");
           fallthru = false;
         }
         break;
       }
@@ skipping 80 matching lines @@
     if (block->IsDeferred()) {
       block->set_ao_number(RpoNumber::FromInt(ao));
       if (!skip[block->rpo_number().ToInt()]) ao++;
     }
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8