revert r32647. r32649 is better one.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@32650 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,8 +1,3 @@
-Sun Jul 24 00:16:13 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* configure.in: changed default optflags to -O0 if the compiler is
-	  llvm-gcc. It prevent ruby crash on OS X 10.7 (Lion).
-
 Sun Jul 24 00:05:00 2011  Jeremy Evans  <merch-redmine@jeremyevans.net>
 
 	* error.c (rb_name_error_str): new function to raise NameError

configure.in

@@ -277,13 +277,7 @@ AC_PROG_GCC_TRADITIONAL
 AC_SUBST(GCC)
 if test "$GCC" = yes; then
     linker_flag=-Wl,
-    if test "$CC -v 2>&1 | grep LLVM" ; then
-	# llvm-gcc's optimization strategy is far different from gcc.
-	# It makes confusing our gcc specific optimized code.
-	: ${optflags=-O0}
-    else
-	: ${optflags=-O3}
-    fi
+    : ${optflags=-O3}
     AS_CASE(["$target_os"], [linux*|darwin*], [: ${debugflags=-ggdb}])
     RUBY_APPEND_OPTIONS(XCFLAGS, ["-include ruby/config.h" "-include ruby/missing.h"])
 else