[AArch64] Add support for a MinGW AArch64 target

Differential Revision: https://reviews.llvm.org/D36364

llvm-svn: 310798
diff --git a/clang/lib/Driver/ToolChains/CrossWindows.cpp b/clang/lib/Driver/ToolChains/CrossWindows.cpp
index 67ce08f..944a089 100644
--- a/clang/lib/Driver/ToolChains/CrossWindows.cpp
+++ b/clang/lib/Driver/ToolChains/CrossWindows.cpp
@@ -36,6 +36,7 @@
     llvm_unreachable("unsupported architecture");
   case llvm::Triple::arm:
   case llvm::Triple::thumb:
+  case llvm::Triple::aarch64:
     break;
   case llvm::Triple::x86:
     CmdArgs.push_back("--32");
@@ -98,6 +99,9 @@
     // FIXME: this is incorrect for WinCE
     CmdArgs.push_back("thumb2pe");
     break;
+  case llvm::Triple::aarch64:
+    CmdArgs.push_back("arm64pe");
+    break;
   case llvm::Triple::x86:
     CmdArgs.push_back("i386pe");
     EntryPoint.append("_");
@@ -111,6 +115,7 @@
     switch (T.getArch()) {
     default:
       llvm_unreachable("unsupported architecture");
+    case llvm::Triple::aarch64:
     case llvm::Triple::arm:
     case llvm::Triple::thumb:
     case llvm::Triple::x86_64: