Subzero: Add a few performance measurement tools.

--timing-funcs - Produces a sorted list of total time spent translating each function.

--timing-focus=<F> - Turns on the --timing equivalent just for one function.  Use '*' to do this for all functions, i.e. get complete timing breakdowns across all functions.

--verbose-focus=<F> - Temporarily turns on --verbose=all for one function.

BUG= none
R=jvoung@chromium.org

Review URL: https://codereview.chromium.org/620373004

src/IceDefs.h

diff --git a/src/IceDefs.h b/src/IceDefs.h
index 98bd8af..29ed5d8 100644
--- a/src/IceDefs.h
+++ b/src/IceDefs.h
@@ -69,6 +69,7 @@
 // numbers are used for representing Variable live ranges.
 typedef int32_t InstNumberT;
 
+typedef uint32_t TimerStackIdT;
 typedef uint32_t TimerIdT;
 
 enum LivenessMode {