ASTUnit: Don't check that input files exist when parsing ASTs from the command
line -- they may be remapped (fake) files. This is useful for testing parsing
entirely from memory.

llvm-svn: 94395
diff --git a/clang/lib/Frontend/ASTUnit.cpp b/clang/lib/Frontend/ASTUnit.cpp
index 2fb47cb..ff19810 100644
--- a/clang/lib/Frontend/ASTUnit.cpp
+++ b/clang/lib/Frontend/ASTUnit.cpp
@@ -324,6 +324,10 @@
   // FIXME: We shouldn't have to pass in the path info.
   driver::Driver TheDriver("clang", "/", llvm::sys::getHostTriple(),
                            "a.out", false, Diags);
+
+  // Don't check that inputs exist, they have been remapped.
+  TheDriver.setCheckInputsExist(false);
+
   llvm::OwningPtr<driver::Compilation> C(
     TheDriver.BuildCompilation(Args.size(), Args.data()));