Fix some minor MSVC compiler warnings.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76356 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86Subtarget.cpp b/lib/Target/X86/X86Subtarget.cpp
index 678139a..733f02f 100644
--- a/lib/Target/X86/X86Subtarget.cpp
+++ b/lib/Target/X86/X86Subtarget.cpp
@@ -365,9 +365,7 @@
         }
       case 15:
         if (HasSSE3) {
-          switch (Model) {
-          default: return "k8-sse3";
-          }
+          return "k8-sse3";
         } else {
           switch (Model) {
           case 1:  return "opteron";
@@ -376,9 +374,7 @@
           }
         }
       case 16:
-        switch (Model) {
-        default: return "amdfam10";
-        }
+        return "amdfam10";
     default:
       return "generic";
     }