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Rename main to:

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Delete main? This cannot be undone.

hip-printf.hip
// REQUIRES: x86-registered-target
// REQUIRES: amdgpu-registered-target

// RUN: %clang -### -target x86_64-linux-gnu --cuda-gpu-arch=gfx900 \
// RUN:   %s 2>&1 | FileCheck %s

// CHECK: [[CLANG:".*clang.*"]] "-cc1"
// CHECK-NOT: "-Werror=format-nonliteral"