Generate a custom OSR entrypoint for OSR compiles on all platforms, and transition to optimized cod…

test/mjsunit/compiler/osr-uint32.js

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-// Flags: --noanalyze_environment_liveness
-
-var r = /r/;
-function f() {
-  r[r] = function() {};
+// Loop to force OSR.
+var j = 0;
+for (var i = 0; i < 80000; i++) {
+    j++;
 }
 
-for (var i = 0; i < 300000; i++) {
-  f();
+function SarShr(val) {
+  return val >> (-2 >>> 0);
 }
+
+var K3 = 0x80000000;
+assertEquals(-2, SarShr(K3 | 0));