Revert of [turbofan] Constant propagation for JumpIfFalse/JumpIfTrue.

src/code-stub-assembler.cc

Index: src/code-stub-assembler.cc
diff --git a/src/code-stub-assembler.cc b/src/code-stub-assembler.cc
index 9e9bb55b72f44d56f9dbf45d599cf0a8b6c822aa..9774ac154b86fd14fa77bc95b5134f7672b15a9d 100644
--- a/src/code-stub-assembler.cc
+++ b/src/code-stub-assembler.cc
@@ -2967,10 +2967,6 @@
 
 Node* CodeStubAssembler::IsWeakCell(Node* object) {
   return HasInstanceType(object, WEAK_CELL_TYPE);
-}
-
-Node* CodeStubAssembler::IsBoolean(Node* object) {
-  return IsBooleanMap(LoadMap(object));
 }
 
 Node* CodeStubAssembler::IsName(Node* object) {