Tweak comments.

Adjust some mispellings in comments.

	* gimple-range-cache.cc: Adjust comments.
	* gimple-range-infer.cc: Adjust comments.
	* gimple-range-infer.h: Adjust comments.
	* gimple-range.cc: Adjust comments.

gcc/gimple-range-cache.cc

@@ -1440,7 +1440,7 @@ ranger_cache::apply_inferred_ranges (gimple *s)
   if (infer.num () == 0)
     return;
 
-  // Do not update the on-netry cache for block ending stmts.
+  // Do not update the on-entry cache for block ending stmts.
   if (stmt_ends_bb_p (s))
     {
       edge_iterator ei;

gcc/gimple-range-infer.cc

@@ -120,7 +120,7 @@ gimple_infer_range::gimple_infer_range (gimple *s)
 
 // -------------------------------------------------------------------------
 
-// This class is an element in list of infered ranges.
+// This class is an element in the list of infered ranges.
 
 class exit_range
 {

gcc/gimple-range-infer.h

@@ -26,7 +26,7 @@ along with GCC; see the file COPYING3.  If not see
 
 // This class manages an on-demand summary of inferred ranges for a statement.
 // It can be instantiated as required and provides a list of inferred ranges.
-// New inferred ranges should added in the constructor of this class.
+// New inferred ranges should be added in the constructor of this class.
 
 class gimple_infer_range
 {
@@ -49,7 +49,7 @@ class gimple_infer_range
 
 // This class manages a list of inferred ranges for each basic block.
 // As inferences are made, they can be registered to a block and later
-// queried.  WHen constructed with a TRUE flag, immediate uses chains are
+// queried.  When constructed with a TRUE flag, immediate uses chains are
 // followed the first time a name is referenced and block populated if
 // there are any inferred ranges.
 

gcc/gimple-range.cc

@@ -118,7 +118,7 @@ gimple_ranger::range_of_expr (irange &r, tree expr, gimple *stmt)
       // If name is defined in this block, try to get an range from S.
       if (def_stmt && gimple_bb (def_stmt) == bb)
 	{
-	  // Declared in ths block, if it has a global set, check for an
+	  // Declared in this block, if it has a global set, check for an
 	  // override from a block walk, otherwise calculate it.
 	  if (m_cache.get_global_range (r, expr))
 	    m_cache.block_range (r, bb, expr, false);