Index: llvm/lib/Analysis/MemorySSA.cpp
===================================================================
--- llvm/lib/Analysis/MemorySSA.cpp
+++ llvm/lib/Analysis/MemorySSA.cpp
@@ -276,11 +276,6 @@
     // clobbers where they don't really exist at all. Please see D43269 for
     // context.
     switch (II->getIntrinsicID()) {
-    case Intrinsic::lifetime_start:
-      if (UseCall)
-        return {false, NoAlias};
-      AR = AA.alias(MemoryLocation(II->getArgOperand(1)), UseLoc);
-      return {AR != NoAlias, AR};
     case Intrinsic::lifetime_end:
     case Intrinsic::invariant_start:
     case Intrinsic::invariant_end:
Index: llvm/unittests/Analysis/MemorySSATest.cpp
===================================================================
--- llvm/unittests/Analysis/MemorySSATest.cpp
+++ llvm/unittests/Analysis/MemorySSATest.cpp
@@ -1205,8 +1205,8 @@
   //   %bar = getelementptr i8, i8* %foo, i64 1
   //   store i8 0, i8* %foo
   //   store i8 0, i8* %bar
-  //   call void @llvm.lifetime.end.p0i8(i64 8, i32* %p)
-  //   call void @llvm.lifetime.start.p0i8(i64 8, i32* %p)
+  //   call void @llvm.lifetime.end.p0i8(i64 8, i32* %foo)
+  //   call void @llvm.lifetime.start.p0i8(i64 8, i32* %foo)
   //   store i8 0, i8* %foo
   //   store i8 0, i8* %bar
   //   ret void
@@ -1263,6 +1263,11 @@
   MemoryAccess *BarClobber =
       MSSA.getWalker()->getClobberingMemoryAccess(BarAccess);
   EXPECT_EQ(BarClobber, LifetimeStartAccess);
+
+  MemoryAccess *LifetimeStartClobber =
+      MSSA.getWalker()->getClobberingMemoryAccess(
+          LifetimeStartAccess, MemoryLocation(Foo));
+  EXPECT_EQ(LifetimeStartClobber, LifetimeStartAccess);
 }
 
 TEST_F(MemorySSATest, DefOptimizationsAreInvalidatedOnMoving) {