Revert parts of "Prevent position errors on Ident(nme.ERROR)"

This reverts commit 0f7b1b0 but keeps the
testcase.

Author: Blaisorblade

compiler/src/dotty/tools/dotc/parsing/Parsers.scala

@@ -518,16 +518,8 @@ object Parsers {
       }
 
     /** Accept identifier and return Ident with its name as a term name. */
-    def termIdent(): Ident = {
-      val start = in.offset
-      val id = makeIdent(in.token, ident())
-      if (id.name != nme.ERROR) {
-        atPos(start)(id)
-      } else {
-        // error identifiers don't consume any characters, so atPos(start)(id) wouldn't set a position.
-        // Some testcases would then fail in Positioned.checkPos. Set a position anyway!
-        atPos(start, start, in.lastOffset)(id)
-      }
+    def termIdent(): Ident = atPos(in.offset) {
+      makeIdent(in.token, ident())
     }
 
     /** Accept identifier and return Ident with its name as a type name. */