Disable Optimization on vframeArray::unpack_to_stack

GCC7 triggers a sigsegv while building:


| JAVA_HOME=/home/ricardo/curro/qt5022/build-qt5022-pyro/build/tmp/work/x86_64-linux/icedtea7-native/2.1.3-r1.0/icedtea-2.1.3/build/bootstrap/jdk1.6.0 ANT_OPTS=-Djava.io.tmpdir='/home/ricardo/curro/qt5022/build-qt5022-pyro/build/tmp/work/x86_64-linux/icedtea7-native/2.1.3-r1.0/icedtea-2.1.3/build/openjdk.build/langtools/build/ant-tmp' /home/ricardo/curro/qt5022/build-qt5022-pyro/build/tmp/work/x86_64-linux/icedtea7-native/2.1.3-r1.0/recipe-sysroot-native/usr/bin/ant -Djdk.version=1.7.0_03 -Dfull.version='1.7.0_03-icedtea-b21'  -Drelease=1.7.0_03 -Dbuild.number=b21 -Djavac.debug=true -Ddebug.classfiles=true -Djavac.target=7 -Djavac.source=7 -Dboot.java.home=/home/ricardo/curro/qt5022/build-qt5022-pyro/build/tmp/work/x86_64-linux/icedtea7-native/2.1.3-r1.0/icedtea-2.1.3/build/bootstrap/jdk1.6.0 -Dimport.jdk=/home/ricardo/curro/qt5022/build-qt5022-pyro/build/tmp/work/x86_64-linux/icedtea7-native/2.1.3-r1.0/icedtea-2.1.3/build/openjdk/jdk  ....
| Buildfile: /home/ricardo/curro/qt5022/build-qt5022-pyro/build/tmp/work/x86_64-linux/icedtea7-native/2.1.3-r1.0/icedtea-2.1.3/build/openjdk/langtools/make/build.xml
| #
| # A fatal error has been detected by the Java Runtime Environment:
| #
| #  SIGSEGV (0xb) at pc=0x00007fad7906e868, pid=9747, tid=140383055484672
| #
| # JRE version: 7.0_03-b21
| # Java VM: OpenJDK 64-Bit Server VM (22.0-b10 mixed mode linux-amd64 compressed oops)
| # Derivative: IcedTea7 2.1.3
| # Distribution: Custom build (Thu Sep  7 09:36:21 CEST 2017)
| # Problematic frame:
| # V  [libjvm.so+0x78b868]  vframeArray::unpack_to_stack(frame&, int, int)+0x88
| #
| # Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
| #
| # An error report file with more information is saved as:
| # /home/ricardo/curro/qt5022/build-qt5022-pyro/build/tmp/work/x86_64-linux/icedtea7-native/2.1.3-r1.0/icedtea-2.1.3/build/openjdk/langtools/make/hs_err_pid9747.log
| #
| # If you would like to submit a bug report, please include
| # instructions on how to reproduce the bug and visit:
| #   http://icedtea.classpath.org/bugzilla
| #
| Aborted


Upstream-Status: Inappropriate

Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
diff --git a/openjdk-boot/hotspot/src/share/vm/runtime/vframeArray.cpp b/build/openjdk-boot/hotspot/src/share/vm/runtime/vframeArray.cpp
index 52b080999224..81b6a09ea91a 100644
--- a/openjdk-boot/hotspot/src/share/vm/runtime/vframeArray.cpp
+++ b/openjdk-boot/hotspot/src/share/vm/runtime/vframeArray.cpp
@@ -500,7 +500,7 @@ void vframeArray::fill_in(JavaThread* thread,
   }
 }
 
-void vframeArray::unpack_to_stack(frame &unpack_frame, int exec_mode, int caller_actual_parameters) {
+void __attribute__((optimize("O0"))) vframeArray::unpack_to_stack(frame &unpack_frame, int exec_mode, int caller_actual_parameters) {
   // stack picture
   //   unpack_frame
   //   [new interpreter frames ] (frames are skeletal but walkable)
diff --git a/openjdk/hotspot/src/share/vm/runtime/vframeArray.cpp b/build/openjdk/hotspot/src/share/vm/runtime/vframeArray.cpp
index 52b080999224..81b6a09ea91a 100644
--- a/openjdk/hotspot/src/share/vm/runtime/vframeArray.cpp
+++ b/openjdk/hotspot/src/share/vm/runtime/vframeArray.cpp
@@ -500,7 +500,7 @@ void vframeArray::fill_in(JavaThread* thread,
   }
 }
 
-void vframeArray::unpack_to_stack(frame &unpack_frame, int exec_mode, int caller_actual_parameters) {
+void __attribute__((optimize("O0"))) vframeArray::unpack_to_stack(frame &unpack_frame, int exec_mode, int caller_actual_parameters) {
   // stack picture
   //   unpack_frame
   //   [new interpreter frames ] (frames are skeletal but walkable)