Do not emit "generic" CPU string. This fixes PR4291.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72696 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp b/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp
index e02bab2..d908cf4 100644
--- a/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp
+++ b/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp
@@ -820,7 +820,9 @@
   // Emit ARM Build Attributes
   if (Subtarget->isTargetELF()) {
     // CPU Type
-    O << "\t.cpu " << Subtarget->getCPUString() << '\n';
+    std::string CPUString = Subtarget->getCPUString();
+    if (CPUString != "generic")
+      O << "\t.cpu " << CPUString << '\n';
 
     // FIXME: Emit FPU type
     if (Subtarget->hasVFP2())