Revert r148138; it's causing test failures.

llvm-svn: 148141
diff --git a/clang/test/Driver/ast.c b/clang/test/Driver/ast.c
index 83dfcc3..e9fbb06 100644
--- a/clang/test/Driver/ast.c
+++ b/clang/test/Driver/ast.c
@@ -1,4 +1,4 @@
-// RUN: %clang -target i386-unknown-unknown -ccc-print-phases -emit-ast %s 2> %t
+// RUN: %clang -ccc-host-triple i386-unknown-unknown -ccc-print-phases -emit-ast %s 2> %t
 // RUN: echo 'END' >> %t
 // RUN: FileCheck -check-prefix EMIT-AST-PHASES -input-file %t %s
 
@@ -10,7 +10,7 @@
 // EMIT-AST-PHASES: END
 
 // RUN: touch %t.ast
-// RUN: %clang -target i386-unknown-unknown -ccc-print-phases -c %t.ast 2> %t
+// RUN: %clang -ccc-host-triple i386-unknown-unknown -ccc-print-phases -c %t.ast 2> %t
 // RUN: echo 'END' >> %t
 // RUN: FileCheck -check-prefix COMPILE-AST-PHASES -input-file %t %s