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diff --git a/test/Frontend/ir-support.c b/test/Frontend/ir-support.c
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+// Test that we can consume LLVM IR/bitcode in the frontend and produce
+// identical output to a standard compilation.
+
+// Reference output:
+// RUN: %clang_cc1 -S -o %t.s %s
+
+// LLVM bitcode:
+// RUN: %clang_cc1 -emit-llvm-bc -o %t.bc %s
+// RUN: %clang_cc1 -S -o - %t.bc > %t.bc.s
+// RUN: diff %t.s %t.bc.s
+
+// LLVM IR source code:
+// RUN: %clang_cc1 -emit-llvm-bc -o %t.ll %s
+// RUN: %clang_cc1 -S -o - %t.ll > %t.ll.s
+// RUN: diff %t.s %t.ll.s
+
+int f() { return 0; }