[clang] [clang][MBD] set up module build daemon infrastructure (PR #67562)

[Michael Spencer via cfe-commits]

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@@ -15,21 +12,12 @@ int main() {return 0;}
 // RUN: %clang -fmodule-build-daemon=mbd-handshake -Rmodule-build-daemon %t/main.c &> %t/output-existing
 // RUN: cat %t/output-existing | FileCheck %s --check-prefix=CHECK-EXIST
 
-// CHECK: remark: Trying to spawn module build daemon [-Rmodule-build-daemon]
+// COM: Check that clang invocation can spawn and handshake with module build daemon
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Bigcheese wrote:

No need for `COM:`.

https://github.com/llvm/llvm-project/pull/67562