Hide cpu name checking in ARMSubtarget.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144154 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMLoadStoreOptimizer.cpp b/lib/Target/ARM/ARMLoadStoreOptimizer.cpp
index a871ed7..4c3be89 100644
--- a/lib/Target/ARM/ARMLoadStoreOptimizer.cpp
+++ b/lib/Target/ARM/ARMLoadStoreOptimizer.cpp
@@ -1080,7 +1080,7 @@
     unsigned OddRegNum  = TRI->getDwarfRegNum(OddReg, false);
     // ARM errata 602117: LDRD with base in list may result in incorrect base
     // register when interrupted or faulted.
-    bool Errata602117 = EvenReg == BaseReg && STI->getCPUString() == "cortex-m3";
+    bool Errata602117 = EvenReg == BaseReg && STI->isCortexM3();
     if (!Errata602117 &&
         ((EvenRegNum & 1) == 0 && (EvenRegNum + 1) == OddRegNum))
       return false;