Merge pull request #8250 from compnerd/hash

IRGen: fix construction of ArrayRef

Author: compnerd

lib/IRGen/IRGen.cpp

@@ -377,7 +377,8 @@ bool swift::performLLVM(IRGenOptions &Opts, DiagnosticEngine *Diags,
       if (DiagMutex) DiagMutex->unlock();
     );
 
-    ArrayRef<uint8_t> HashData(Result, sizeof(MD5::MD5Result));
+    ArrayRef<uint8_t> HashData(reinterpret_cast<uint8_t *>(&Result),
+                               sizeof(Result));
     if (Opts.OutputKind == IRGenOutputKind::ObjectFile &&
         !Opts.PrintInlineTree &&
         !needsRecompile(OutputFilename, HashData, HashGlobal, DiagMutex)) {

lib/IRGen/IRGenModule.cpp

@@ -1058,8 +1058,8 @@ bool IRGenModule::finalize() {
     // We have to create the variable now (before we emit the global lists).
     // But we want to calculate the hash later because later we can do it
     // multi-threaded.
-    llvm::MD5::MD5Result zero = { 0 };
-    ArrayRef<uint8_t> ZeroArr(zero, sizeof(llvm::MD5::MD5Result));
+    llvm::MD5::MD5Result zero{};
+    ArrayRef<uint8_t> ZeroArr(reinterpret_cast<uint8_t *>(&zero), sizeof(zero));
     auto *ZeroConst = llvm::ConstantDataArray::get(Module.getContext(), ZeroArr);
     ModuleHash = new llvm::GlobalVariable(Module, ZeroConst->getType(), true,
                                           llvm::GlobalValue::PrivateLinkage,