This test was failing in our internal CI, since our driver does not default to
C11. Adding this switch fixes the issue.
Differential Revision: https://reviews.llvm.org/D94327
// This tests loop unrolling and loop deletion (enabled under -O1)
-// RUN: %clang_cc1 -O1 -fno-unroll-loops -S -o - %s -emit-llvm | FileCheck %s
+// RUN: %clang_cc1 -std=c11 -O1 -fno-unroll-loops -S -o - %s -emit-llvm | FileCheck %s
// RUN: %clang_cc1 -std=c99 -O1 -fno-unroll-loops -S -o - %s -emit-llvm | FileCheck %s --check-prefix C99
extern int a[16];