i#1569 AArch64: Make drcachesim template looser.

On one AArch64 system drcachesim.simple gave "Child hits" around
91,850-91,870 and a "Total miss rate" around 2.19% while the regular
expression expected a 6-digit number and less than 2%, respectively.
Adjust the regular expression to allow 30,000-999,999 and 0-3.99%.

Review-URL: https://codereview.appspot.com/310860043

clients/drcachesim/tests/drcachesim-simple.templatex

@@ -16,5 +16,5 @@ LL stats:
     Hits:                              [0-9]..
     Misses:                       *[0-9]*[,\.]?...
 .*   Local miss rate:                 [0-9].[,\.]..%
-    Child hits:                   *[0-9]..[,\.]?...
-    Total miss rate:                  [0-1][,\.]..%
+    Child hits:                   *([3-9]|[1-9].).[,\.]?...
+    Total miss rate:                  [0-3][,\.]..%