Merge pull request #11538 from adrian-prantl/33993056

Author: swift-ci

test/DebugInfo/modulecache.swift

@@ -7,15 +7,15 @@ import ClangModule
 
 // 1. Test that swift-ide-test creates a thin module without debug info.
 
+// RUN: %empty-directory(%t)
 // RUN: %swift-ide-test_plain -print-usrs -target %target-triple -module-cache-path %t  -I %S/Inputs -source-filename %s
-// RUN: %target-swift-frontend %s -c -g -o %t.o -module-cache-path %t -I %S/Inputs
-// RUN: file %t/*/ClangModule-*.pcm | grep data
+// RUN: head -c 4 %t/*/ClangModule-*.pcm | grep -q CPCH
 
 // 2. Test that swift is creating clang modules with debug info.
 
 // RUN: %empty-directory(%t)
 // RUN: %target-swift-frontend %s -c -g -o %t.o -module-cache-path %t -I %S/Inputs
-// RUN: file %t/*/ClangModule-*.pcm | egrep '(Mach-O|ELF)'
+// RUN: file %t/*/ClangModule-*.pcm | egrep -q '(Mach-O|ELF)'
 
 // 3. Test that swift-ide-check will not share swiftc's module cache.