Remove the concept of early errors from the compiler.

Currently only parse errors prevent emitting (And this will be changed in the next
code review as well).

src/compiler/program.ts

@@ -113,13 +113,8 @@ module ts {
             return emitHost || (emitHost = createEmitHostFromProgram(program));
         }
 
-        function hasEarlyErrors(sourceFile?: SourceFile): boolean {
-            return forEach(getDiagnosticsProducingTypeChecker().getDiagnostics(sourceFile), d => d.isEarly);
-        }
-
         function isEmitBlocked(sourceFile?: SourceFile): boolean {
             return getDiagnostics(sourceFile).length !== 0 ||
-                hasEarlyErrors(sourceFile) ||
                 (options.noEmitOnError && getDiagnosticsProducingTypeChecker().getDiagnostics(sourceFile).length !== 0);
         }