[PM] Fix Typo

[sarnex]

Summary

Trivial

[sarnex]

@jlebar Thanks for the review. Can you push this? I don't have access.

[jlebar]

Sure thing, pushing now.

include/llvm/IR/PassManager.h

for (unsigned Idx = 0, Size = Passes.size(); Idx != Size; ++Idx) {
 
       // FIXME: Historically, the pass managers all called the LLVM context's
       // yield function here. We don't have a generic way to acquire the
       // context and it isn't yet clear what the right pattern is for yielding
       // in the new pass manager so it is currently omitted.
       //IR.getContext().yield();
     }
 
-    // Invaliadtion was handled after each pass in the above loop for the
+    // Invalidation was handled after each pass in the above loop for the
     // current unit of IR. Therefore, the remaining analysis results in the
     // AnalysisManager are preserved. We mark this with a set so that we don't
     // need to inspect each one individually.
     PA.preserveSet<AllAnalysesOn<IRUnitT>>();
 
     if (DebugLogging)
       dbgs() << "Finished " << getTypeName<IRUnitT>() << " pass manager run.\n";