Access double fields in C++ as uint64_t fields to preserve signaling bit of a NaN.

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index 0148a29a319dee305d82a86492b04d717325e7d1..a93c76040d420626c64df48cdb06ec950562835c 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -1963,9 +1963,8 @@ class Heap {
                           AllocationSite* allocation_site = NULL);
 
   // Allocates a HeapNumber from value.
-  MUST_USE_RESULT AllocationResult
-  AllocateHeapNumber(double value, MutableMode mode = IMMUTABLE,
-                     PretenureFlag pretenure = NOT_TENURED);
+  MUST_USE_RESULT AllocationResult AllocateHeapNumber(
+      MutableMode mode = IMMUTABLE, PretenureFlag pretenure = NOT_TENURED);
 
 // Allocates SIMD values from the given lane values.
 #define SIMD_ALLOCATE_DECLARATION(TYPE, Type, type, lane_count, lane_type) \