Everywhere: Add sv suffix to strings relying on StringView(char const*)

Each of these strings would previously rely on StringView's char const*
constructor overload, which would call __builtin_strlen on the string.
Since we now have operator ""sv, we can replace these with much simpler
versions. This opens the door to being able to remove
StringView(char const*).

No functional changes.

Userland/Libraries/LibJS/Bytecode/Pass/MergeBlocks.cpp

@@ -126,7 +126,7 @@ void MergeBlocks::perform(PassPipelineExecutable& executable)
 
         size_t size = 0;
         StringBuilder builder;
-        builder.append("merge");
+        builder.append("merge"sv);
         for (auto& entry : successors) {
             size += entry->size();
             builder.append('.');