configure: Accept llvm-3.2

Previously the build system only checked for llvm-3.1 - 2.8.
Now also 3.2 and 3.2svn is accepted.

Signed-off-by: Fabian Deutsch <fabian.deutsch@gmx.de>
configure: cleanup - parsing supported target triples
hashmap: improve docstring
ops: add a docstring
base64: add docstring
syntax: Add new values that can be used with the quasiquoter
syntax: pass some values around by reference
std: clean json test imports
std: serializing Options should use the right case
std: change fail_unless to assert_eq in json.rs
std: fix json PrettyEncoder and add tests
std: Add tests for json decoding options
std: change default json enum encoder to use strings or a flat vec
std: add option type directly to serialize::{En,De}code
std: Decode::read_enum_variant should pass in the variant names

Because the json::Decoder uses the string variant name, we need a
way to correlate the string to the enum index. This passes in a
static &[&str] to read_enum_variant, which allows the json::Decoder
to know which branch it's trying to process.
std: add tests for decoding json enums
syntax: Fix parsing global generics (Closes #5572)
syntax: Remove dead code from the parser
syntax: fix pretty printing __log stmts
syntax: Remove deprecated expr_vstore_fixed