Remove fast generator description.  Change assign description.
@@ -256,11 +256,10 @@ ex100: func v, 0
* **Find Loops**: finding natural loops and building loop tree
* **Build Live Info**: calculating live in and live out for the basic blocks
* **Build Live Ranges**: calculating program point ranges for registers
- * **Assign**: priority-based assigning hard regs and stack slots to registers
+ * **Assign**: fast RA for `-O0` or priority-based linear scan RA for `-O1` and above
* **Rewrite**: transform MIR according to the assign using reserved hard regs
* **Combine** (code selection): merging data-depended insns into one
* **Dead Code Elimination**: removing insns with unused outputs
- * **Fast Generator**: 4-5 times faster generation of code whose performance is on par with `-O0` of GCC/Clang
* **Generate Machine Insns**: run machine-dependent code creating machine insns
## C to MIR translation
