Add support for Ananas platform

Ananas is a home-brew operating system, mainly for amd64 machines. After
using GCC for quite some time, it has switched to clang and never looked
back - yet, having to manually patch things is annoying, so it'd be much
nicer if this was in the official tree.

More information:

https://github.com/zhmu/ananas/
https://rink.nu/projects/ananas.html

Submitted by:	Rink Springer
Differential Revision:	https://reviews.llvm.org/D32936

llvm-svn: 306239
diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index c8f389b..f239758 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -11,6 +11,7 @@
 #include "InputInfo.h"
 #include "ToolChains/AMDGPU.h"
 #include "ToolChains/AVR.h"
+#include "ToolChains/Ananas.h"
 #include "ToolChains/Bitrig.h"
 #include "ToolChains/Clang.h"
 #include "ToolChains/CloudABI.h"
@@ -3749,6 +3750,9 @@
     case llvm::Triple::Haiku:
       TC = llvm::make_unique<toolchains::Haiku>(*this, Target, Args);
       break;
+    case llvm::Triple::Ananas:
+      TC = llvm::make_unique<toolchains::Ananas>(*this, Target, Args);
+      break;
     case llvm::Triple::CloudABI:
       TC = llvm::make_unique<toolchains::CloudABI>(*this, Target, Args);
       break;