Partially revert 071e428c

gcc/ChangeLog:

	* doc/gcc/gcc-command-options/machine-dependent-options/x86-options.rst:
	  Revert.
	* doc/gcc/gcc-command-options/option-summary.rst:
	  Revert.

gcc/doc/gcc/gcc-command-options/machine-dependent-options/x86-options.rst

@@ -1614,9 +1614,3 @@ on x86-64 processors in 64-bit environments.
 .. option:: -mdirect-extern-access
 
   Default setting; overrides :option:`-mno-direct-extern-access`.
-
-.. option:: -munroll-only-small-loops
-  Controls conservative small loop unrolling. It is default enbaled by
-  O2, and unrolls loop with less than 4 insns by 1 time. Explicit
-  -f[no-]unroll-[all-]loops would disable this flag to avoid any
-  unintended unrolling behavior that user does not want.

gcc/doc/gcc/gcc-command-options/option-summary.rst

@@ -1490,8 +1490,7 @@ in the following sections.
   :option:`-mgeneral-regs-only`  :option:`-mcall-ms2sysv-xlogues` :option:`-mrelax-cmpxchg-loop` |gol|
   :option:`-mindirect-branch=choice`  :option:`-mfunction-return=choice` |gol|
   :option:`-mindirect-branch-register` :option:`-mharden-sls=choice` |gol|
-  :option:`-mindirect-branch-cs-prefix` :option:`-mneeded` :option:`-mno-direct-extern-access` |gol|
-  :option:`-munroll-only-small-loops`
+  :option:`-mindirect-branch-cs-prefix` :option:`-mneeded` :option:`-mno-direct-extern-access`
 
   *x86 Windows Options*