tests: add a basic test for the time tracer

It's not tested whether the output is valid or sensible, only that the
compiler doesn't crash when time tracing is enabled.

Author: zerbina

tests/compilerfeatures/ttimetrace.nim

@@ -0,0 +1,9 @@
+discard """
+  description: "Make sure some code can be compiled with time-tracing enabled"
+  targets: "c js vm"
+  matrix: "--timetrace:on"
+"""
+
+# import some modules so that there's some processing for the compiler
+# to trace
+import std/[strutils, macros]