radeonsi: add LLVMNoUnwindAttribute to intrinsic

So LLVM can better eliminate dead code.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Tom Stellard <thomas.stellard@amd.com>
diff --git a/src/gallium/drivers/radeonsi/radeonsi_shader.c b/src/gallium/drivers/radeonsi/radeonsi_shader.c
index 144e0e0..95ccd1e 100644
--- a/src/gallium/drivers/radeonsi/radeonsi_shader.c
+++ b/src/gallium/drivers/radeonsi/radeonsi_shader.c
@@ -431,7 +431,7 @@
 						"llvm.SI.packf16",
 						LLVMInt32TypeInContext(base->gallivm->context),
 						args, 2,
-						LLVMReadNoneAttribute);
+						LLVMReadNoneAttribute | LLVMNoUnwindAttribute);
 			args[chan + 7] = args[chan + 5] =
 				LLVMBuildBitCast(base->gallivm->builder,
 						 args[chan + 5],