Change some dyn_cast to more apropriate isa. NFC

llvm-svn: 357773
diff --git a/llvm/lib/Transforms/IPO/SampleProfile.cpp b/llvm/lib/Transforms/IPO/SampleProfile.cpp
index b6ea014..2955c33 100644
--- a/llvm/lib/Transforms/IPO/SampleProfile.cpp
+++ b/llvm/lib/Transforms/IPO/SampleProfile.cpp
@@ -1329,7 +1329,7 @@
           annotateValueSite(*I.getParent()->getParent()->getParent(), I,
                             SortedCallTargets, Sum, IPVK_IndirectCallTarget,
                             SortedCallTargets.size());
-        } else if (!dyn_cast<IntrinsicInst>(&I)) {
+        } else if (!isa<IntrinsicInst>(&I)) {
           I.setMetadata(LLVMContext::MD_prof,
                         MDB.createBranchWeights(
                             {static_cast<uint32_t>(BlockWeights[BB])}));