SimpleLexer now stops at Id.Eol_Tok instead of checking the position.

The makes the echo -e/glob lexers more consistent with the OSH lexer.

osh/match.py

@@ -81,13 +81,11 @@ def __init__(self, match_func):
  def Tokens(self, line):
    """Yields tokens."""
    pos = 0
    # NOTE: We're not using Eol_Tok like LineLexer.  We probably should.  And
    # then the consumers of the ECHO_E_DEF and GLOB_DEF should use it.  Get rid
    # of Glob_Eof.
    n = len(line)
    while pos != n:
      # NOTE: Need longest-match semantics to find \377 vs \.
    while True:
      tok_type, end_pos = self.match_func(line, pos)
      # core/lexer_gen.py always inserts this.  We're always parsing lines.
      if tok_type == Id.Eol_Tok:
        break
      yield tok_type, line[pos:end_pos]
      pos = end_pos