fix macro name

* tool/instruction.rb (VmBodyGenerator#make_header_prepare_stack):
  REG_CFP has been prefixed with VM_ at r56609.  [Bug #12527]

* tool/instruction.rb (VmBodyGenerator#make_footer_stack_val):
  ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57792 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

tool/instruction.rb

@@ -700,7 +700,7 @@ class RubyVM
 
       n = 0
       push_ba.each {|pushs| n += pushs.length}
-      commit "  CHECK_VM_STACK_OVERFLOW_FOR_INSN(REG_CFP, #{n});" if n > 0
+      commit "  CHECK_VM_STACK_OVERFLOW_FOR_INSN(VM_REG_CFP, #{n});" if n > 0
       push_ba.each{|pushs|
         pushs.each{|r|
           commit "  PUSH(SCREG(#{r}));"
@@ -850,7 +850,7 @@ class RubyVM
       each_footer_stack_val(insn){|v|
         n += 1 unless v[2]
       }
-      commit "  CHECK_VM_STACK_OVERFLOW_FOR_INSN(REG_CFP, #{n});" if n > 0
+      commit "  CHECK_VM_STACK_OVERFLOW_FOR_INSN(VM_REG_CFP, #{n});" if n > 0
       each_footer_stack_val(insn){|v|
         if v[2]
           commit "  SCREG(#{v[2]}) = #{v[1]};"