This reverts commit 828afaa2.

This reverts commit 828afaa2.

Lots of changes around memory managment in the Runtime. Added memory regions and fixed race caused by calling rust_srv::malloc() from multiple threads when sending messages.

Add a "special" rust_log flag to be used for debugging in cases where the full log output prevents races from occurring.

Add support for a reserved-words list and reserve the various not-supported-but-plausible IEEE datatypes.

Putting out the burning tree on Windows. Turns out you can completely starve threads by not yielding on windows/vmware, really weird.

Absent any deep overhauls to syntax or constant-handling, hack in the ability to project a cexp var binding to a token in the parser. Use it in comp/rustc.rc and comp/lib/llvm.rs.

Fix max_sz bug that ended up causing us to index incorrectly into a vec of tag types.  Add a testcase.