fixup! SchedWrite -> SchedRead typo

Author: michaelmaitland

llvm/utils/TableGen/SubtargetEmitter.cpp

@@ -964,7 +964,7 @@ Record *SubtargetEmitter::FindReadAdvance(const CodeGenSchedRW &SchedRead,
       continue;
     // If there is no AliasDef and we find a match, we can early exit since
     // there is no need to verify whether there are resources defined for both
-    // SchedWrite and its alias.
+    // SchedRead and its alias.
     if (!AliasDef && SchedRead.TheDef == RA->getValueAsDef("ReadType")) {
       ResDef = RA;
       break;