sync code with last improvements from OpenBSD

lib/mesa/mk/libamd_common_llvm/Makefile

@@ -0,0 +1,38 @@
+#	$OpenBSD: Makefile,v 1.2 2022/09/02 05:46:37 jsg Exp $
+
+LIB=	amd_common_llvm
+
+NOPROFILE=
+
+SRCS=	ac_llvm_build.c \
+	ac_llvm_cull.c \
+	ac_llvm_helper.cpp \
+	ac_llvm_util.c \
+	ac_nir_to_llvm.c
+
+.include "../Makefile.inc"
+
+CFLAGS+=	${C_VIS_ARGS}
+CXXFLAGS+=	${CXX_VIS_ARGS}
+CPPFLAGS+=	-I${MESA_SRC}/src/gallium/include \
+		-I${MESA_SRC}/src/gallium/auxiliary \
+		-I${MESA_SRC}/src/amd \
+		-I${MESA_SRC}/src/amd/llvm \
+		-I${MESA_SRC}/src/amd/common \
+		-I${MESA_SRC}/src/mesa \
+		-I${MESA_SRC}/src/compiler \
+		-I${MESA_SRC}/src/compiler/nir \
+		-I${MESA_SRC}/generated/src/compiler/nir \
+		-I${MESA_SRC}/generated/src/amd/common
+
+LLVM_CXXFLAGS!= llvm-config --cxxflags
+CXXFLAGS+= ${LLVM_CXXFLAGS}
+
+install:
+
+obj: _xenocara_obj
+
+.include <bsd.lib.mk>
+.include <bsd.xorg.mk>
+
+.PATH: ${MESA_SRC}/src/amd/llvm