Change global const handling to silently ignore redeclarations

test/cctest/test-decls.cc

Index: test/cctest/test-decls.cc
diff --git a/test/cctest/test-decls.cc b/test/cctest/test-decls.cc
index 619839185e651aab3e16787145ea154872357404..643e60a7d6f8710d22791244e27deb66b8d108de 100644
--- a/test/cctest/test-decls.cc
+++ b/test/cctest/test-decls.cc
@@ -285,18 +285,18 @@ TEST(Present) {
 
   { PresentPropertyContext context;
     context.Check("const x; x",
+                  1,  // access
                   0,
-                  0,
-                  1,  // (re-)declaration
-                  EXPECT_EXCEPTION);  // x has already been declared!
+                  2,  // (re-)declaration + initialization
+                  EXPECT_EXCEPTION);  // x is not defined!
   }
 
   { PresentPropertyContext context;
     context.Check("const x = 0; x",
+                  1,  // access
                   0,
-                  0,
-                  1,  // (re-)declaration
-                  EXPECT_EXCEPTION);  // x has already been declared!
+                  2,  // (re-)declaration + initialization
+                  EXPECT_EXCEPTION);  // x is not defined!
   }
 }
 
@@ -429,18 +429,20 @@ TEST(Appearing) {
 
   { AppearingPropertyContext context;
     context.Check("const x; x",
-                  0,
+                  1,  // access
                   1,  // declaration
                   2,  // declaration + initialization
-                  EXPECT_EXCEPTION);  // x has already been declared!
+                  EXPECT_RESULT, Undefined());
   }
 
   { AppearingPropertyContext context;
     context.Check("const x = 0; x",
-                  0,
+                  1,  // access
                   1,  // declaration
                   2,  // declaration + initialization
-                  EXPECT_EXCEPTION);  //  x has already been declared!
+                  EXPECT_RESULT, Undefined());
+                  // Result is undefined because declaration succeeded but
+                  // initialization to 0 failed (due to context behavior).
   }
 }
 
@@ -498,7 +500,7 @@ TEST(Reappearing) {
                   0,
                   2,  // var declaration + const initialization
                   4,  // 2 x declaration + 2 x initialization
-                  EXPECT_EXCEPTION);  // x has already been declared!
+                  EXPECT_RESULT, Undefined());
   }
 }