Avoid using Function.prototype.call in a number of places in our

test/mjsunit/debug-backtrace-text.js

Index: test/mjsunit/debug-backtrace-text.js
diff --git a/test/mjsunit/debug-backtrace-text.js b/test/mjsunit/debug-backtrace-text.js
index 67c674667b7e43cbdd8b9205e581eb3c2fd4d039..61648fa4e2e6ee4e8554556db02e18acd93fe0b1 100644
--- a/test/mjsunit/debug-backtrace-text.js
+++ b/test/mjsunit/debug-backtrace-text.js
@@ -80,9 +80,9 @@ function listener(event, exec_state, event_data, data) {
       // 1: Call distance on Point where distance is a direct property
       // 2: Call on function an array element 2
       // 3: [anonymous]
-      assertEquals("#<a Point>.distanceTo(p=#<a Point>)", exec_state.frame(0).invocationText());
-      assertEquals("#<a Point>.distanceTo(p=#<a Point>)", exec_state.frame(1).invocationText());
-      assertEquals("#<an Array>[2](aka distance)(p=#<a Point>, q=#<a Point>)", exec_state.frame(2).invocationText());
+      assertEquals("#<Point>.distanceTo(p=#<Point>)", exec_state.frame(0).invocationText());
+      assertEquals("#<Point>.distanceTo(p=#<Point>)", exec_state.frame(1).invocationText());
+      assertEquals("#<Array>[2](aka distance)(p=#<Point>, q=#<Point>)", exec_state.frame(2).invocationText());
       assertEquals("[anonymous]()", exec_state.frame(3).invocationText());
       listenerCalled = true;
     } else {