Add flag for running with a non standard number of stress-runs.

This allows easy testing with more than 5/2 stress runs in
release/debug and will allow us to have a nightly run with e.g., 10
stress runs in debug mode.



Review URL: http://codereview.chromium.org/5903003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6050 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/api.cc

@@ -4979,6 +4979,7 @@ void Testing::SetStressRunType(Testing::StressType type) {
 }
 
 int Testing::GetStressRuns() {
+  if (internal::FLAG_stress_runs != 0) return internal::FLAG_stress_runs;
 #ifdef DEBUG
   // In debug mode the code runs much slower so stressing will only make two
   // runs.

src/flag-definitions.h

@@ -141,6 +141,7 @@ DEFINE_bool(use_osr, true, "use on-stack replacement")
 DEFINE_bool(use_osr, false, "use on-stack replacement")
 #endif
 DEFINE_bool(trace_osr, false, "trace on-stack replacement")
+DEFINE_int(stress_runs, 0, "number of stress runs")
 
 // assembler-ia32.cc / assembler-arm.cc / assembler-x64.cc
 DEFINE_bool(debug_code, false,