Fix typo

Fix typo and commit as obvious.

Signed-off-by: Xionghu Luo <xionghuluo@tencent.com>

gcc/ChangeLog:

	* cgraph.cc (cgraph_edge::redirect_call_stmt_to_callee): Fix
	typo.
	* tree-ssa-loop-ivopts.cc (struct iv_cand): Likewise.
	* tree-switch-conversion.h: Likewise.

gcc/cgraph.cc

@@ -1423,7 +1423,7 @@ cgraph_edge::redirect_call_stmt_to_callee (cgraph_edge *e)
       else
 	{
 	  /* Be sure we redirect all speculative targets before poking
-	     abou tindirect edge.  */
+	     about indirect edge.  */
 	  gcc_checking_assert (e->callee);
 	  cgraph_edge *indirect = e->speculative_call_indirect_edge ();
 	  gcall *new_stmt;

gcc/tree-ssa-loop-ivopts.cc

@@ -469,7 +469,7 @@ struct iv_cand
   bitmap inv_vars;	/* The list of invariant ssa_vars used in step of the
 			   iv_cand.  */
   bitmap inv_exprs;	/* If step is more complicated than a single ssa_var,
-			   hanlde it as a new invariant expression which will
+			   handle it as a new invariant expression which will
 			   be hoisted out of loop.  */
   struct iv *orig_iv;	/* The original iv if this cand is added from biv with
 			   smaller type.  */

gcc/tree-switch-conversion.h

@@ -249,7 +249,7 @@ public:
 
 /* Concrete subclass of group_cluster representing a collection
    of cases to be implemented as a jump table.
-   The "emit" vfunc gernerates a nested switch statement which
+   The "emit" vfunc generates a nested switch statement which
    is later lowered to a jump table.  */
 
 class jump_table_cluster: public group_cluster