[PATCH] Add support for le64.

[Derek Schuff]

================
Comment at: lib/Basic/Targets.cpp:6009
@@ +6008,3 @@
+  bool hasProtectedVisibility() const override { return false; }
+  CallingConvCheckResult checkCallingConvention(CallingConv CC) const override {
+    return CC == CC_PnaclCall ? CCCR_OK : CCCR_Warning;
----------------
you can remove the support for pnaclcall callingconv, which we dont use anymore. Once we merge to tip, I'm going to remove it upstream.

http://reviews.llvm.org/D5318