Rewrite parser as recursive descent (#591)

* Remove Bison dependency
* Remove pre-generated parser files
* Rename build config from no-re2c-bison to no-re2c
* Add a simple make_unique implementation
* Move handling of module bindings into ir.cc
* Simplify lexer
  - Remove lookahead, the parser handles this now
  - Unify Token/LexerToken, it only contains terminal values now
  - Refactor setting token type and value into one function (e.g.
    LITERAL, RETURN => RETURN_LITERAL)
* New Parser
  - Uses two tokens of lookahead (use Peek(0) or Peek(1))
  - Consume() consumes one token of any kind
  - Match(t) consumes the current token if it matches
  - PeekMatch(t) returns true iff the token matches, but doesn't consume
  - Basic error synchronization; plenty of room for improvement here

1 files changed, 1 insertions, 1 deletions

diff --git a/test/parse/bad-error-long-token.txt b/test/parse/bad-error-long-token.txt
index fce3fd2c..5236637d 100644
--- a/test/parse/bad-error-long-token.txt
+++ b/test/parse/bad-error-long-token.txt
@@ -1,7 +1,7 @@
 ;;; ERROR: 1
               abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz                                                   
 (;; STDERR ;;;
-out/test/parse/bad-error-long-token.txt:2:15: error: unexpected token "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"
+out/test/parse/bad-error-long-token.txt:2:15: error: unexpected token "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz", expected a module field or a command.
               abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijk...
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 ;;; STDERR ;;)