RFR [XS] 8041658: Use of -fdevirtualize on macroAssembler_x86.o (via -O2) with gcc 4.9.0 creates broken VM

[Andrew Hughes]

Webrev: http://cr.openjdk.java.net/~andrew/8041658/webrev.01/
Bug: https://bugs.openjdk.java.net/browse/JDK-8041658
Earlier discussion: http://mail.openjdk.java.net/pipermail/hotspot-dev/2014-April/013577.html

It is necessary to pass -fno-devirtualize to gcc when building macroAssembler_x86.o with
gcc 4.9.0, as otherwise a return statement is missing in
MacroAssembler::jump_cc(Assembler::Condition, AddressLiteral) and control flow enters whatever
method happens to follow it.
-- 
Andrew :)

Free Java Software Engineer
Red Hat, Inc. (http://www.redhat.com)

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