Update LLVM from stable upstream (#1653)

Replace CheckedMalloc with upstream safe_malloc.

wpiutil/src/main/native/include/wpi/StringMap.h

@@ -18,9 +18,10 @@
 #include "wpi/StringRef.h"
 #include "wpi/iterator.h"
 #include "wpi/iterator_range.h"
+#include "wpi/MemAlloc.h"
 #include "wpi/PointerLikeTypeTraits.h"
+#include "wpi/ErrorHandling.h"
 #include "wpi/deprecated.h"
-#include "wpi/memory.h"
 #include <algorithm>
 #include <cassert>
 #include <cstdint>
@@ -163,7 +164,7 @@ public:
     size_t AllocSize = sizeof(StringMapEntry) + KeyLength + 1;
 
     StringMapEntry *NewItem =
-      static_cast<StringMapEntry*>(CheckedMalloc(AllocSize));
+      static_cast<StringMapEntry*>(safe_malloc(AllocSize));
 
     // Construct the value.
     new (NewItem) StringMapEntry(KeyLength, std::forward<InitTy>(InitVals)...);
@@ -358,12 +359,6 @@ public:
     return try_emplace(KV.first, std::move(KV.second));
   }
 
-  template <typename... ArgsTy>
-  WPI_DEPRECATED("use try_emplace instead")
-  std::pair<iterator, bool> emplace_second(StringRef Key, ArgsTy &&... Args) {
-    return try_emplace(Key, std::forward<ArgsTy>(Args)...);
-  }
-
   /// Emplace a new element for the specified key into the map if the key isn't
   /// already in the map. The bool component of the returned pair is true
   /// if and only if the insertion takes place, and the iterator component of