Alter/remove tests that include/concern ternary

3 tests, pretty/block-disambig.rs, run-pass/operator-overloading.rs,
and run-pass/weird-exprs.rs, all included the ternary operator.  These
were changed to use the if-then-else construct instead.

2 tests, run-pass/block-arg-in-ternary.rs and run-pass/ternary.rs, were
only there because of the ternary operator, and were removed.

src/test/pretty/block-disambig.rs

@@ -24,7 +24,7 @@ fn test7() -> uint {
     (*regs < 2) as uint
 }
 
-fn test8() -> int { let val = @0; alt true { true { } } *val < 1 ? 0 : 1 }
+fn test8() -> int { let val = @0; alt true { true { } } if *val < 1 { 0 } else { 1 } }
 
 fn test9() { let regs = @mutable 0; alt true { true { } } *regs += 1; }
 

src/test/run-pass/operator-overloading.rs

@@ -11,7 +11,7 @@ impl point_ops for point {
         {x: -self.x, y: -self.y}
     }
     fn [](x: bool) -> int {
-        x ? self.x : self.y
+        if x { self.x } else { self.y }
     }
 }
 

src/test/run-pass/weird-exprs.rs

@@ -19,7 +19,7 @@ fn zombiejesus() {
     do  {
         while (ret) {
             if (ret) {
-                alt (ret) { _ { ret ? ret : ret } };
+                alt (ret) { _ { if ret { ret } else { ret } } };
             } else if (ret) {
                 ret;
             }