Write output file to temp directory. The tests shouldn't assume that

they can write to the current working directory.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@240388 91177308-0d34-0410-b5e6-96231b3b80d8

test/Modules/explicit-build-prefer-self.cpp

 // RUN: rm -rf %t
-// RUN: %clang_cc1 -fmodules -fno-implicit-modules -emit-module -fmodule-name=a %S/Inputs/explicit-build-prefer-self/map -o a.pcm
-// RUN: %clang_cc1 -fmodules -fno-implicit-modules -emit-module -fmodule-name=b %S/Inputs/explicit-build-prefer-self/map -o b.pcm
+// RUN: %clang_cc1 -fmodules -fno-implicit-modules -emit-module -fmodule-name=a %S/Inputs/explicit-build-prefer-self/map -o %t/a.pcm
+// RUN: %clang_cc1 -fmodules -fno-implicit-modules -emit-module -fmodule-name=b %S/Inputs/explicit-build-prefer-self/map -o %t/b.pcm