[compiler] Delay allocation of code-embedded heap numbers.

src/assembler.cc

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 // - Redistributions of source code must retain the above copyright notice,
 // this list of conditions and the following disclaimer.
 //
@@ skipping 172 matching lines @@
 #else
   CpuFeatures::FlushICache(start, size);
 #endif  // USE_SIMULATOR
 }
 
 void AssemblerBase::Print(Isolate* isolate) {
   OFStream os(stdout);
   v8::internal::Disassembler::Decode(isolate, &os, buffer_, pc_, nullptr);
 }
 
+AssemblerBase::RequestedHeapNumber::RequestedHeapNumber(double value,
+                                                        int offset)
+    : value(value), offset(offset) {
+  DCHECK(!IsSmiDouble(value));
+}
+
+void AssemblerBase::AllocateRequestedHeapNumbers(Isolate* isolate) {
+  for (auto& heap_number : heap_numbers_) {
+    Handle<HeapObject> object = isolate->factory()->NewHeapNumber(
+        heap_number.value, IMMUTABLE, TENURED);
+    Assembler::set_heap_number(object, buffer_ + heap_number.offset);
+  }
+}
 
 // -----------------------------------------------------------------------------
 // Implementation of PredictableCodeSizeScope
 
 PredictableCodeSizeScope::PredictableCodeSizeScope(AssemblerBase* assembler)
     : PredictableCodeSizeScope(assembler, -1) {}
 
 
 PredictableCodeSizeScope::PredictableCodeSizeScope(AssemblerBase* assembler,
                                                    int expected_size)
@@ skipping 1781 matching lines @@
   RecordRelocInfo(mode);
 }
 
 
 void Assembler::DataAlign(int m) {
   DCHECK(m >= 2 && base::bits::IsPowerOfTwo32(m));
   while ((pc_offset() & (m - 1)) != 0) {
     db(0);
   }
 }
+
 }  // namespace internal
 }  // namespace v8