Fix code completion tests to use an explicit modules cache path

Otherwise the stale module cache data may cause the test to fail.  These
two tests are new and are the only instances of c-index-test with
-fmodules that doesn't have an explicit module cache path.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@242710 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeCompletion/macros-in-modules.c

@@ -2,7 +2,7 @@
 // RUN: echo 'module Foo { header "foo.h" }' > %t/module.modulemap
 // RUN: echo '#define FOO_MACRO 42' > %t/foo.h
 // RUN: c-index-test -code-completion-at=%s:9:1 -I %t %s | FileCheck %s
-// RUN: c-index-test -code-completion-at=%s:9:1 -I %t -fmodules %s | FileCheck %s
+// RUN: c-index-test -code-completion-at=%s:9:1 -I %t -fmodules -fmodules-cache-path=%t %s | FileCheck %s
 
 #include "foo.h"
 int x =

test/CodeCompletion/macros-in-modules.m

 // RUN: rm -rf %t && mkdir %t
 // RUN: echo 'module Foo { header "foo.h" }' > %t/module.modulemap
 // RUN: echo '#define FOO_MACRO 42' > %t/foo.h
-// RUN: c-index-test -code-completion-at=%s:8:1 -I %t -fmodules %s | FileCheck %s
+// RUN: c-index-test -code-completion-at=%s:8:1 -I %t -fmodules-cache-path=%t -fmodules %s | FileCheck %s
 
 @import Foo;
 int x =