gallivm: print declarations of intrinsics with GALLIVM_DEBUG=ir

Those aren't really interesting, however outputting them is helpful when
trying to feed the IR to llvm llc (or opt) for debugging.

Reviewed-by: Jose Fonseca <jfonseca@vmware.com>

src/gallium/auxiliary/gallivm/lp_bld_intr.c

@@ -51,6 +51,7 @@
 #include "lp_bld_intr.h"
 #include "lp_bld_type.h"
 #include "lp_bld_pack.h"
+#include "lp_bld_debug.h"
 
 
 void
@@ -146,6 +147,10 @@ lp_build_intrinsic(LLVMBuilderRef builder,
 
       if (attr)
           LLVMAddFunctionAttr(function, attr);
+
+      if (gallivm_debug & GALLIVM_DEBUG_IR) {
+         lp_debug_dump_value(function);
+      }
    }
 
    return LLVMBuildCall(builder, function, args, num_args, "");