8278532: Fix some typos in compiler comments

Reviewed-by: kvn, jiefu

src/hotspot/share/c1/c1_FrameMap.hpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2021, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -43,7 +43,7 @@ class CallingConvention;
 //--------------------------------------------------------
 
 //  This class is responsible of mapping items (locals, monitors, spill
-//  slots and registers to their frame location
+//  slots and registers) to their frame location
 //
 //  The monitors are specified by a consecutive index, although each monitor entry
 //  occupies two words. The monitor_index is 0.._num_monitors

src/hotspot/share/c1/c1_GraphBuilder.cpp

@@ -3091,7 +3091,7 @@ BlockBegin* GraphBuilder::setup_start_block(int osr_bci, BlockBegin* std_entry,
   // each method.  Previously, each method started with the
   // start-block created below, and this block was followed by the
   // header block that was always empty.  This header block is only
-  // necesary if std_entry is also a backward branch target because
+  // necessary if std_entry is also a backward branch target because
   // then phi functions may be necessary in the header block.  It's
   // also necessary when profiling so that there's a single block that
   // can increment the the counters.

src/hotspot/share/c1/c1_ValueMap.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2021, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -505,7 +505,7 @@ GlobalValueNumbering::GlobalValueNumbering(IR* ir)
   assert(start_block == ir->start() && start_block->number_of_preds() == 0 && start_block->dominator() == NULL, "must be start block");
   assert(start_block->next()->as_Base() != NULL && start_block->next()->next() == NULL, "start block must not have instructions");
 
-  // method parameters are not linked in instructions list, so process them separateley
+  // method parameters are not linked in instructions list, so process them separately
   for_each_state_value(start_block->state(), value,
      assert(value->as_Local() != NULL, "only method parameters allowed");
      set_processed(value);

src/hotspot/share/opto/phaseX.hpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2021, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -241,7 +241,7 @@ class PhaseTransform : public Phase {
   // Record an initial type for a node, the node's bottom type.
   void    set_type_bottom(const Node* n) {
     // Use this for initialization when bottom_type() (or better) is not handy.
-    // Usually the initialization shoudl be to n->Value(this) instead,
+    // Usually the initialization should be to n->Value(this) instead,
     // or a hand-optimized value like Type::MEMORY or Type::CONTROL.
     assert(_types[n->_idx] == NULL, "must set the initial type just once");
     _types.map(n->_idx, n->bottom_type());