llvmpipe: Handle TGSI_TOKEN_TYPE_PROPERTY.

Avoids assertion failures with certain shaders.

src/gallium/auxiliary/gallivm/lp_bld_interp.c

@@ -376,6 +376,7 @@ lp_build_interp_soa_init(struct lp_build_interp_soa_context *bld,
 
       case TGSI_TOKEN_TYPE_INSTRUCTION:
       case TGSI_TOKEN_TYPE_IMMEDIATE:
+      case TGSI_TOKEN_TYPE_PROPERTY:
          break;
 
       default:

src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c

@@ -1498,6 +1498,9 @@ lp_build_tgsi_soa(LLVMBuilderRef builder,
          }
          break;
 
+      case TGSI_TOKEN_TYPE_PROPERTY:
+         break;
+
       default:
          assert( 0 );
       }