Fix tests to not depend on /dev/null existing.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@85908 91177308-0d34-0410-b5e6-96231b3b80d8

test/Frontend/dependency-gen.c

@@ -1,7 +1,8 @@
 // rdar://6533411
-// RUN: clang -MD -MF %t.d -c -x c -o %t.o /dev/null && 
+// RUN: clang -MD -MF %t.d -c -x c -o %t.o %s && 
 // RUN: grep '.*dependency-gen.*:' %t.d &&
-// RUN: grep '/dev/null' %t.d &&
+// RUN: grep 'dependency-gen.c' %t.d &&
 
-// RUN: clang -M -x c /dev/null -o %t.deps &&
-// RUN: grep 'null.o: /dev/null' %t.deps
+// RUN: clang -M -x c %s -o %t.d &&
+// RUN: grep '.*dependency-gen.*:' %t.d &&
+// RUN: grep 'dependency-gen.c' %t.d

test/PCH/pr4489.c

@@ -1,5 +1,6 @@
 // RUN: clang -x c-header -o %t.pch %s &&
-// RUN: clang -include %t -x c /dev/null -emit-llvm -S -o -
+// RUN: echo > %t.empty.c &&
+// RUN: clang -include %t -x c %t.empty.c -emit-llvm -S -o -
 // PR 4489: Crash with PCH
 // PR 4492: Crash with PCH (round two)
 // PR 4509: Crash with PCH (round three)