Revert "rustc_driver: Print stage info in --version --verbose"

This reverts commit 555b021.

Author: brson

src/librustc_driver/lib.rs

@@ -481,21 +481,6 @@ pub fn commit_date_str() -> Option<&'static str> {
     option_env!("CFG_VER_DATE")
 }
 
-/// Returns a stage string, such as "stage0".
-pub fn stage_str() -> Option<&'static str> {
-    if cfg!(stage0) {
-        Some("stage0")
-    } else if cfg!(stage1) {
-        Some("stage1")
-    } else if cfg!(stage2) {
-        Some("stage2")
-    } else if cfg!(stage3) {
-        Some("stage3")
-    } else {
-        None
-    }
-}
-
 /// Prints version information
 pub fn version(binary: &str, matches: &getopts::Matches) {
     let verbose = matches.opt_present("verbose");
@@ -508,7 +493,6 @@ pub fn version(binary: &str, matches: &getopts::Matches) {
         println!("commit-date: {}", unw(commit_date_str()));
         println!("host: {}", config::host_triple());
         println!("release: {}", unw(release_str()));
-        println!("stage: {}", unw(stage_str()));
     }
 }