[turbofan] Moved split edge form validation lower

src/compiler/instruction.cc

Index: src/compiler/instruction.cc
diff --git a/src/compiler/instruction.cc b/src/compiler/instruction.cc
index 5eb0d88bb2bf5064e70c0eba7a236f60ee7a4e5d..1d28a1bf36cb8024d61ba40eafb525afbd450801 100644
--- a/src/compiler/instruction.cc
+++ b/src/compiler/instruction.cc
@@ -682,10 +682,6 @@ InstructionSequence::InstructionSequence(Isolate* isolate,
       representations_(zone()),
       deoptimization_entries_(zone()) {
   block_starts_.reserve(instruction_blocks_->size());
-
-#if DEBUG
-  ValidateEdgeSplitForm();
-#endif
 }