[RISCV] Add pre-defined macro tests for Andes vendor extension. NFC. (#141172)

Author: tclin914

clang/test/Preprocessor/riscv-target-features-andes.c

@@ -0,0 +1,32 @@
+// RUN: %clang --target=riscv32-unknown-linux-gnu -march=rv32i -E -dM %s \
+// RUN:   -o - | FileCheck %s
+// RUN: %clang --target=riscv64-unknown-linux-gnu -march=rv64i -E -dM %s \
+// RUN:   -o - | FileCheck %s
+
+// CHECK-NOT: __riscv_xandesperf {{.*$}}
+// CHECK-NOT: __riscv_xandesvpackfph {{.*$}}
+// CHECK-NOT: __riscv_xandesvdot {{.*$}}
+
+// RUN: %clang --target=riscv32 \
+// RUN:   -march=rv32i_xandesperf -E -dM %s \
+// RUN:   -o - | FileCheck --check-prefix=CHECK-XANDESPERF %s
+// RUN: %clang --target=riscv64 \
+// RUN:   -march=rv64i_xandesperf -E -dM %s \
+// RUN:   -o - | FileCheck --check-prefix=CHECK-XANDESPERF %s
+// CHECK-XANDESPERF: __riscv_xandesperf  5000000{{$}}
+
+// RUN: %clang --target=riscv32 \
+// RUN:   -march=rv32i_xandesvpackfph -E -dM %s \
+// RUN:   -o - | FileCheck --check-prefix=CHECK-XANDESVPACKFPH %s
+// RUN: %clang --target=riscv64 \
+// RUN:   -march=rv64i_xandesvpackfph -E -dM %s \
+// RUN:   -o - | FileCheck --check-prefix=CHECK-XANDESVPACKFPH %s
+// CHECK-XANDESVPACKFPH: __riscv_xandesvpackfph  5000000{{$}}
+
+// RUN: %clang --target=riscv32 \
+// RUN:   -march=rv32i_xandesvdot -E -dM %s \
+// RUN:   -o - | FileCheck --check-prefix=CHECK-XANDESVDOT %s
+// RUN: %clang --target=riscv64 \
+// RUN:   -march=rv64i_xandesvdot -E -dM %s \
+// RUN:   -o - | FileCheck --check-prefix=CHECK-XANDESVDOT %s
+// CHECK-XANDESVDOT: __riscv_xandesvdot  5000000{{$}}