It can be useful to have the symbol file(s) for a test present during execution - particularly those tests that involve crash reports or native stacks. Proposed fix:

--- a/make/common/TestFilesCompilation.gmk
+++ b/make/common/TestFilesCompilation.gmk
@@ -106,7 +106,7 @@ define SetupTestFilesCompilationBody
         LIBS := $$($1_LIBS_$$(name)), \
         TOOLCHAIN := $(if $$(filter %.cpp, $$(file)), TOOLCHAIN_LINK_CXX, TOOLCHAIN_DEFAULT), \
         OPTIMIZATION := $$(if $$($1_OPTIMIZATION_$$(name)),$$($1_OPTIMIZATION_$$(name)),LOW), \
- COPY_DEBUG_SYMBOLS := false, \
+ COPY_DEBUG_SYMBOLS := $$(if $$($1_COPY_DEBUG_SYMBOLS_$$(name)),$$($1_COPY_DEBUG_SYMBOLS_$$(name)),false), \
         STRIP_SYMBOLS := $$(if $$($1_STRIP_SYMBOLS_$$(name)),$$($1_STRIP_SYMBOLS_$$(name)),false), \
         BUILD_INFO_LOG_MACRO := LogInfo, \
     )) \

this allows one to set e.g.

BUILD_HOTSPOT_JTREG_LIBRARIES_COPY_DEBUG_SYMBOLS_libnativeStack := true

in make/test/JtregNativeHotspot.gmk