Removed unnecessary throw when building stack trace

Since 4.0, all supported JS runtimes populate the stack property of
Error objects when the Error is instantiated, not when it's thrown.

lib/jasmine-core/jasmine.js

@@ -2645,11 +2645,7 @@ getJasmineRequireObj().buildExpectationResult = function(j$) {
         } else if (options.stack) {
           error = options;
         } else {
-          try {
-            throw new Error(message());
-          } catch (e) {
-            error = e;
-          }
+          error = new Error(message());
         }
       }
       // Omit the message from the stack trace because it will be

src/core/buildExpectationResult.js

@@ -69,11 +69,7 @@ getJasmineRequireObj().buildExpectationResult = function(j$) {
         } else if (options.stack) {
           error = options;
         } else {
-          try {
-            throw new Error(message());
-          } catch (e) {
-            error = e;
-          }
+          error = new Error(message());
         }
       }
       // Omit the message from the stack trace because it will be