[turbofan] Try to allocate preferred register after splitting range.

src/compiler/register-allocator.cc

Index: src/compiler/register-allocator.cc
diff --git a/src/compiler/register-allocator.cc b/src/compiler/register-allocator.cc
index 403c344aee09209934a6581f0d5695aee71aeffd..618cb3955b946223a5fbec93a8449d16f6abe924 100644
--- a/src/compiler/register-allocator.cc
+++ b/src/compiler/register-allocator.cc
@@ -3150,6 +3150,9 @@ bool LinearScanAllocator::TryAllocateFreeReg(
     // the range end. Split current at position where it becomes blocked.
     LiveRange* tail = SplitRangeAt(current, pos);
     AddToUnhandledSorted(tail);
+
+    // Try to allocate preferred register once more.
+    if (TryAllocatePreferredReg(current, free_until_pos)) return true;
   }
 
   // Register reg is available at the range start and is free until the range