[test] Ensure random generator in JSTests does not use float arithmetic

Change-Id: I3530c3f50fdb805d68099108dc33d93abe6bdb39
Bug: v8:8344
Reviewed-on: https://chromium-review.googlesource.com/c/1379931Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58267}

benchmarks/base.js

@@ -87,6 +87,7 @@ Math.random = (function() {
   var seed = 49734321;
   return function() {
     // Robert Jenkins' 32 bit integer hash function.
+    seed = seed & 0xffffffff;
     seed = ((seed + 0x7ed55d16) + (seed << 12))  & 0xffffffff;
     seed = ((seed ^ 0xc761c23c) ^ (seed >>> 19)) & 0xffffffff;
     seed = ((seed + 0x165667b1) + (seed << 5))   & 0xffffffff;

benchmarks/spinning-balls/v.js

@@ -136,6 +136,7 @@ Math.random = (function() {
   var seed = 49734321;
   return function() {
     // Robert Jenkins' 32 bit integer hash function.
+    seed = seed & 0xffffffff;
     seed = ((seed + 0x7ed55d16) + (seed << 12))  & 0xffffffff;
     seed = ((seed ^ 0xc761c23c) ^ (seed >>> 19)) & 0xffffffff;
     seed = ((seed + 0x165667b1) + (seed << 5))   & 0xffffffff;

test/js-perf-test/base.js

@@ -106,6 +106,7 @@ BenchmarkSuite.ResetRNG = function() {
     var seed = 49734321;
     return function() {
       // Robert Jenkins' 32-bit integer hash function.
+      seed = seed & 0xffffffff;
       seed = ((seed + 0x7ed55d16) + (seed << 12))  & 0xffffffff;
       seed = ((seed ^ 0xc761c23c) ^ (seed >>> 19)) & 0xffffffff;
       seed = ((seed + 0x165667b1) + (seed << 5))   & 0xffffffff;

test/mjsunit/unicodelctest-no-optimization.js

@@ -60,6 +60,7 @@ function rand() {
   // To make the test results predictable, we use a 100% deterministic
   // alternative.
   // Robert Jenkins' 32 bit integer hash function.
+  seed = seed & 0xffffffff;
   seed = ((seed + 0x7ed55d16) + (seed << 12))  & 0xffffffff;
   seed = ((seed ^ 0xc761c23c) ^ (seed >>> 19)) & 0xffffffff;
   seed = ((seed + 0x165667b1) + (seed << 5))   & 0xffffffff;

test/mjsunit/unicodelctest.js

@@ -59,6 +59,7 @@ function rand() {
   // To make the test results predictable, we use a 100% deterministic
   // alternative.
   // Robert Jenkins' 32 bit integer hash function.
+  seed = seed & 0xffffffff;
   seed = ((seed + 0x7ed55d16) + (seed << 12))  & 0xffffffff;
   seed = ((seed ^ 0xc761c23c) ^ (seed >>> 19)) & 0xffffffff;
   seed = ((seed + 0x165667b1) + (seed << 5))   & 0xffffffff;