RFR: JDK-8172791 - solving issues with ReservedStack Area

[Frederic Parain]

Greetings,

Please review this fix which addresses several issues with the ReservedStackArea
implementation:
  1 - the method look_for_reserved_stack_annotated_method() fails to detect in-lined
       annotated methods, making the annotation ineffective for in-lined methods 
  2 - sometime an assertion failure related to reserved area status occurs after incorrect
       restoring of guards pages during a return from runtime

Bug:
https://bugs.openjdk.java.net/browse/JDK-8172791

webrev:
http://cr.openjdk.java.net/~fparain/8172791/webrev.00/index.html

This fix has been contributed by Andrew Haley.

Thank you,

Fred