Update install scripts

Update install script

Remove runtime assembly code

Update GCC Torture test

Change generated label names at translator level

Drop kefir runtime library

Remove unused test file

Reimplement inf and huge_val builtins

Move bswap builtins from runtime library to codegen

Move remaining bit manipulation builtins from runtime library to codegen

Move some bit manipulation builtins from runtime library to codegen

Move frame/return builtins from runtime library to codegen

Move trap routine from runtime library to codegen

Move atomic routines from runtime library to codegen

Move fenv update from runtime library to codegen

Move floating-point operations from runtime library to codegen

Deduplicate constant placement in code generator

Move scalar floating-point operations from runtime library to codegen

Optimize vararg start code generation

Extend gcc bootstrap test to include g++