Commits on Aug 24, 2022

1. test: fix DebugSymbolsTest.ReqWrapList on PPC64LE …

   Currently, DebugSymbolsTest.ReqWrapList fails on PPC64LE when Node has
   been configured with Link Time Optimization (LTO) and using RHEL 8.5
   and gcc:
   ```console
   $ . /opt/rh/gcc-toolset-11/enable
   $ export CC='ccache gcc'
   $ export CXX='ccache g++'
   $ ./configure --enable-lto
   $ make -j8 cctest
   ...
   21:52:27 [ RUN      ] DebugSymbolsTest.ReqWrapList
   21:52:27 ../test/cctest/test_node_postmortem_metadata.cc:203: Failure
   21:52:27 Expected equality of these values:
   21:52:27   expected
   21:52:27     Which is: 140736537072320
   21:52:27   calculated
   21:52:27     Which is: 1099680328560
   21:52:27 [  FAILED  ] DebugSymbolsTest.ReqWrapList (43 ms)
   ```
   
   After looking into this is seems that the compiler is tampering with the
   `last` variable when compiling with LTO enabled. This commit suggests
   adding volatile to this variable to prevent the compiler from tampering
   with it.

   

   danbev committed Aug 24, 2022
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