fix(ci): Add -fno-gpu-sanitize flag to HOST_ASAN builds

Recently HOST_ASAN is default for Multi-Arch CI to improve efficiency:
(#7110)

There is an issue with HOST_ASAN Multi-Arch CI. MIOpen uses -Werror and during HOST_ASAN
this reports a warning that -fsanitize=address is not supported unless xnack+ is
appended to the gfx target. Regular ASAN builds override the gfx942 target with
gfx942:xnack+ and do not see this issue.

-fno-gpu-sanitize is used to explicitly disable sanitizer checks for GPU device target
compilations, but allows host sanitization to remain.

Author: estewart08

cmake/therock_sanitizers.cmake

@@ -46,6 +46,12 @@ function(therock_sanitizer_configure
     # so make the sanitizer imply shared linkage.
     string(APPEND _stanza "string(APPEND CMAKE_CXX_FLAGS_INIT \" -fsanitize=${_sanitizer_string} -fno-omit-frame-pointer -g\")\n")
     string(APPEND _stanza "string(APPEND CMAKE_C_FLAGS_INIT \" -fsanitize=${_sanitizer_string} -fno-omit-frame-pointer -g\")\n")
+    # MIOpen uses -Werror and the HOST_ASAN path with non +xnack gfx target will throw a warning that -fsanitize=address
+    # is not supported. This will fail the math-libs step during HOST_ASAN Multi-Arch CI. Passing -fno-gpu-sanitize supresses this warning.
+    if(_sanitizer STREQUAL "HOST_ASAN")
+      string(APPEND _stanza "string(APPEND CMAKE_CXX_FLAGS_INIT \" -fno-gpu-sanitize\")\n")
+      string(APPEND _stanza "string(APPEND CMAKE_C_FLAGS_INIT \" -fno-gpu-sanitize\")\n")
+    endif()
 
     # Sharp edge: The -shared-libsan flag is compiler frontend specific:
     #   gcc (and gfortran): defaults to shared sanitizer linkage