bpf: define __bpf__ as well as __BPF__ as a target macro

LLVM defines both __bpf__ and __BPF_ as target macros.
GCC was defining only __BPF__.

This patch defines __bpf__ as a target macro for BPF.
Tested in bpf-unknown-none.

gcc/ChangeLog:

	* config/bpf/bpf.cc (bpf_target_macros): Define __bpf__ as a
	target macro.

1 files changed, 1 insertions, 0 deletions

diff --git a/gcc/config/bpf/bpf.cc b/gcc/config/bpf/bpf.cc
index 7e37e08..9cb56cf 100644
--- a/gcc/config/bpf/bpf.cc
+++ b/gcc/config/bpf/bpf.cc
@@ -291,6 +291,7 @@ void
 bpf_target_macros (cpp_reader *pfile)
 {
   builtin_define ("__BPF__");
+  builtin_define ("__bpf__");
 
   if (TARGET_BIG_ENDIAN)
     builtin_define ("__BPF_BIG_ENDIAN__");