[AArch64] Add Tiny Code Model for AArch64

Adds a tiny code model to Clang along side rL340397.

Differential Revision: https://reviews.llvm.org/D49674

llvm-svn: 340398
diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
index 74476bb..8e836b1 100644
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -370,7 +370,7 @@
   if (Arg *A = Args.getLastArg(OPT_mcode_model)) {
     StringRef Value = A->getValue();
     if (Value == "small" || Value == "kernel" || Value == "medium" ||
-        Value == "large")
+        Value == "large" || Value == "tiny")
       return Value;
     Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Value;
   }