rename isLoad -> isSimpleLoad due to evan's desire to have such a predicate.

llvm-svn: 45667
diff --git a/llvm/lib/Target/Alpha/AlphaInstrFormats.td b/llvm/lib/Target/Alpha/AlphaInstrFormats.td
index 2df4ebc..366aea83 100644
--- a/llvm/lib/Target/Alpha/AlphaInstrFormats.td
+++ b/llvm/lib/Target/Alpha/AlphaInstrFormats.td
@@ -41,7 +41,7 @@
 class MForm<bits<6> opcode, bit load, string asmstr, list<dag> pattern, InstrItinClass itin> 
         : InstAlpha<opcode, asmstr, itin> {
   let Pattern = pattern;
-  let isLoad = load;
+  let isSimpleLoad = load;
   let Defs = [R28]; //We may use this for frame index calculations, so reserve it here
 
   bits<5> Ra;