Simplify per review feedback

Author: preames

llvm/lib/Transforms/Scalar/MemCpyOptimizer.cpp

@@ -1212,7 +1212,7 @@ bool MemCpyOptPass::processMemCpyMemCpyDependence(MemCpyInst *M,
     // Don't convert llvm.memcpy.inline into memmove because memmove can be
     // lowered as a call, and that is not allowed for llvm.memcpy.inline (and
     // there is no inline version of llvm.memmove)
-    if (auto *MCI = dyn_cast<MemCpyInst>(M); MCI && MCI->isForceInlined())
+    if (M->isForceInlined())
       return false;
     UseMemMove = true;
   }
@@ -1229,19 +1229,17 @@ bool MemCpyOptPass::processMemCpyMemCpyDependence(MemCpyInst *M,
     NewM =
         Builder.CreateMemMove(M->getDest(), M->getDestAlign(), CopySource,
                               CopySourceAlign, M->getLength(), M->isVolatile());
-  else if (auto *MCI = dyn_cast<MemCpyInst>(M)) {
-    if (MCI->isForceInlined())
-      // llvm.memcpy may be promoted to llvm.memcpy.inline, but the converse is
-      // never allowed since that would allow the latter to be lowered as a call
-      // to an external function.
-      NewM = Builder.CreateMemCpyInline(M->getDest(), M->getDestAlign(),
-                                        CopySource, CopySourceAlign,
-                                        M->getLength(), M->isVolatile());
-    else
-      NewM = Builder.CreateMemCpy(M->getDest(), M->getDestAlign(), CopySource,
-                                  CopySourceAlign, M->getLength(),
-                                  M->isVolatile());
-  }
+  else if (M->isForceInlined())
+    // llvm.memcpy may be promoted to llvm.memcpy.inline, but the converse is
+    // never allowed since that would allow the latter to be lowered as a call
+    // to an external function.
+    NewM = Builder.CreateMemCpyInline(M->getDest(), M->getDestAlign(),
+                                      CopySource, CopySourceAlign,
+                                      M->getLength(), M->isVolatile());
+  else
+    NewM = Builder.CreateMemCpy(M->getDest(), M->getDestAlign(), CopySource,
+                                CopySourceAlign, M->getLength(),
+                                M->isVolatile());
 
   NewM->copyMetadata(*M, LLVMContext::MD_DIAssignID);