use the "symbol" helper function in all exports
move all declarations from common.zig to compiler_rt.zig
flatten the tree structure somewhat (move contents of tiny files into
parent files)
No functional changes.
stage2: change logic for detecting whether the main package is inside
the std package. Previously it relied on realpath() which is not portable.
This uses resolve() which is how imports already work.
* stage2: fix cleanup bug when creating Module
* flatten lib/std/special/* to lib/*
- this was motivated by making main_pkg_is_inside_std false for
compiler_rt & friends.
* rename "mini libc" to "universal libc"