[llvm] RuntimeLibcalls: Add bitset for available libcalls (PR #150869)

[Matt Arsenault via llvm-commits]

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@@ -597,23 +602,47 @@ void RuntimeLibcallEmitter::emitSystemRuntimeLibrarySetCalls(
         continue;
       }
 
+      size_t BitIdx = LibCallImpl->getEnumVal();
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arsenm wrote:

I don't think so. 0 is the special case Unsupported entry (which should always have the value 0). 

https://github.com/llvm/llvm-project/pull/150869