Improve reproducibility of test runs.

test/cctest/test-types.cc

Index: test/cctest/test-types.cc
diff --git a/test/cctest/test-types.cc b/test/cctest/test-types.cc
index 3448a841bde55b9aadbf59b365f06364207792fc..7b727c71d9f9004e1568a4597d22c1ccb1f23a7b 100644
--- a/test/cctest/test-types.cc
+++ b/test/cctest/test-types.cc
@@ -29,6 +29,7 @@
 
 #include "cctest.h"
 #include "types.h"
+#include "utils/random-number-generator.h"
 
 using namespace v8::internal;
 
@@ -112,6 +113,8 @@ class Types {
     objects.push_back(array);
   }
 
+  RandomNumberGenerator rng;
+
   TypeHandle Representation;
   TypeHandle Semantic;
   TypeHandle None;
@@ -180,14 +183,14 @@ class Types {
   }
 
   TypeHandle Fuzz(int depth = 5) {
-    switch (rand() % (depth == 0 ? 3 : 20)) {
+    switch (rng.NextInt(depth == 0 ? 3 : 20)) {
       case 0: {  // bitset
         int n = 0
         #define COUNT_BITSET_TYPES(type, value) + 1
         BITSET_TYPE_LIST(COUNT_BITSET_TYPES)
         #undef COUNT_BITSET_TYPES
         ;
-        int i = rand() % n;
+        int i = rng.NextInt(n);
         #define PICK_BITSET_TYPE(type, value) \
           if (i-- == 0) return Type::type(region_);
         BITSET_TYPE_LIST(PICK_BITSET_TYPE)
@@ -195,13 +198,13 @@ class Types {
         UNREACHABLE();
       }
       case 1:  // class
-        switch (rand() % 2) {
+        switch (rng.NextInt(2)) {
           case 0: return ObjectClass;
           case 1: return ArrayClass;
         }
         UNREACHABLE();
       case 2:  // constant
-        switch (rand() % 6) {
+        switch (rng.NextInt(6)) {
           case 0: return SmiConstant;
           case 1: return Signed32Constant;
           case 2: return ObjectConstant1;
@@ -211,7 +214,7 @@ class Types {
         }
         UNREACHABLE();
       default: {  // union
-        int n = rand() % 10;
+        int n = rng.NextInt(10);
         TypeHandle type = None;
         for (int i = 0; i < n; ++i) {
           type = Type::Union(type, Fuzz(depth - 1), region_);