For CPU nanoseconds a lot of the stat-shadow metrics use either
task-clock or cpu-clock, the latter being used when
target__has_cpu. Add a #target_cpu literal so that json metrics can
perform the same test.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/util/expr.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/perf/util/expr.c b/tools/perf/util/expr.c
index 7fda0ff89c16..4df56f2b283d 100644
--- a/tools/perf/util/expr.c
+++ b/tools/perf/util/expr.c
@@ -409,6 +409,9 @@ double expr__get_literal(const char *literal, const struct expr_scanner_ctx *ctx
 	} else if (!strcmp("#core_wide", literal)) {
 		result = core_wide(ctx->system_wide, ctx->user_requested_cpu_list)
 			? 1.0 : 0.0;
+	} else if (!strcmp("#target_cpu", literal)) {
+		result = (ctx->system_wide || ctx->user_requested_cpu_list)
+			? 1.0 : 0.0;
 	} else {
 		pr_err("Unrecognized literal '%s'", literal);
 	}
-- 
2.51.2.1041.gc1ab5b90ca-goog