Internalize strings in-place

src/compiler/instruction-selector.cc

Index: src/compiler/instruction-selector.cc
diff --git a/src/compiler/instruction-selector.cc b/src/compiler/instruction-selector.cc
index ae96b9106f390d72ed11e34ae2ab027c00d6f244..a83dcb8d754f66b1ddf4085544dc70a9bf6c2ab8 100644
--- a/src/compiler/instruction-selector.cc
+++ b/src/compiler/instruction-selector.cc
@@ -907,6 +907,8 @@ void InstructionSelector::VisitControl(BasicBlock* block) {
   if (block->SuccessorCount() > 1) {
     for (BasicBlock* const successor : block->successors()) {
       for (Node* const node : *successor) {
+        // If this CHECK fails, you might have specified merged variables
+        // for a label with only one predecessor.
         CHECK(!IrOpcode::IsPhiOpcode(node->opcode()));
       }
     }