[Mips] Set mips64r6 as default CPU for MIPS64 Android

Change default CPU for MIPS64 Android. Now it is mips64r6.

Differential Revision: http://reviews.llvm.org/D11294

llvm-svn: 242522
diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index 38ed12b..d4a307b 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -941,6 +941,10 @@
     DefMips32CPU = "mips32r6";
     DefMips64CPU = "mips64r6";
   }
+ 
+  // MIPS64r6 is the default for Android MIPS64 (mips64el-linux-android).
+  if (Triple.getEnvironment() == llvm::Triple::Android)
+    DefMips64CPU = "mips64r6";
 
   // MIPS3 is the default for mips64*-unknown-openbsd.
   if (Triple.getOS() == llvm::Triple::OpenBSD)