Explicitly free heap when tests are finished

Allow global building with address sanitizer

Limit max depth of CPS IR dump

Separate sanitizer flags from other CFLAGS

Add directive to allow dumping CPS tree

Small code simplification

Move more usages of `appendCode` to specialised instructions

Add specialised instruction for fake-bitcast renaming of values

Add specialised instruction for "unreachable"

Insert external declarations for RTS functions as needed

Fix constNamespace range for foreign functions

Make sleep and usleep handle interruptions correctly

Catch unhandled types in genericC foreign calls

Foreign call result wrapping must happen _before_ the updated heap pointer is loaded

Refactor memcpy usage

Make debug "emissionKind" dynamic to avoid generating huge .eh_frame sections when no needed

Add support for Illumos

Replace termio.h with POSIX standard termios.h

Add all requried LDFLAGS to RAPID_RUNTIME_LDFLAGS variable

Include termio for terminal ioctl constants