IRGen: Address llvm::Instruction::{move,insert}Before deprecations

See llvm/llvm-project@79499f0.

Author: AnthonyLatsis

lib/IRGen/IRGenSIL.cpp

@@ -907,7 +907,7 @@ class IRGenSILFunction :
 
       llvm::Instruction *Cloned = Orig->clone();
       Cloned->setOperand(0, Inner);
-      Cloned->insertBefore(Orig);
+      Cloned->insertBefore(Orig->getIterator());
       return static_cast<llvm::Value *>(Cloned);
     };
     if (auto *LdInst = dyn_cast<llvm::LoadInst>(Storage))
@@ -5762,7 +5762,7 @@ static Address isSafeForMemCpyPeephole(const TypeInfo &TI, SILArgument *arg,
     return Address();
   }
 
-  lifetimeBegin->moveBefore(load);
+  lifetimeBegin->moveBefore(load->getIterator());
 
   // Set insertPt to the first load such that we are within the lifetime of the
   // alloca marked by the lifetime intrinsic.

lib/LLVMPasses/LLVMARCOpts.cpp

@@ -398,7 +398,7 @@ static bool performLocalReleaseMotion(CallInst &Release, BasicBlock &BB,
   // there) move the release to the top of the block.
   // TODO: This is where we'd plug in some global algorithms someday.
   if (&*BBI != &Release) {
-    Release.moveBefore(&*BBI);
+    Release.moveBefore(BBI);
     return true;
   }
 
@@ -520,7 +520,7 @@ static bool performLocalRetainMotion(CallInst &Retain, BasicBlock &BB,
   // If we were able to move the retain down, move it now.
   // TODO: This is where we'd plug in some global algorithms someday.
   if (MadeProgress) {
-    Retain.moveBefore(&*BBI);
+    Retain.moveBefore(BBI);
     return true;
   }