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. PR-URL: #44341 Reviewed-By: Richard Lau <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Franziska Hinkelmann <[email protected]>

Author: danbev

test/cctest/test_node_postmortem_metadata.cc

@@ -194,7 +194,8 @@ TEST_F(DebugSymbolsTest, ReqWrapList){
 // ARM64 CI machinies.
 for (auto it : *(*env)->req_wrap_queue()) (void) ⁢
 
-auto last = tail + nodedbg_offset_ListNode_ReqWrap__next___uintptr_t;
+volatileuintptr_t last =
+ tail + nodedbg_offset_ListNode_ReqWrap__next___uintptr_t;
  last = *reinterpret_cast<uintptr_t*>(last);
 
 auto expected = reinterpret_cast<uintptr_t>(&obj);