radv: add a LLVM version string workaround for SotTR and ACO

When the LLVM version is too old or missing, SotTR applies shader
workarounds and that reduces performance by 2-5% with ACO.

SotTR workarounds are applied with LLVM 8 and older, so reporting
LLVM 9.0.1 should be fine.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Edmondo Tommasina <edmondo.tommasina@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4984>

src/util/00-mesa-defaults.conf

@@ -673,4 +673,9 @@ TODO: document the other workarounds.
             <option name="vs_position_always_invariant" value="true" />
         </application>
     </device>
+    <device driver="radv">
+        <application name="Shadow Of The Tomb Raider" executable="ShadowOfTheTombRaider">
+            <option name="radv_report_llvm9_version_string" value="true" />
+        </application>
+    </device>
 </driconf>

src/util/xmlpool/t_options.h

@@ -421,3 +421,12 @@ DRI_CONF_OPT_END
 DRI_CONF_OPT_BEGIN_V(gles_samples_passed_value, def, minimum, maximum) \
         DRI_CONF_DESC(en,gettext("GL_SAMPLES_PASSED value when emulated by GL_ANY_SAMPLES_PASSED")) \
 DRI_CONF_OPT_END
+
+/**
+ * \brief RADV specific configuration options
+ */
+
+#define DRI_CONF_RADV_REPORT_LLVM9_VERSION_STRING(def) \
+DRI_CONF_OPT_BEGIN_B(radv_report_llvm9_version_string, def) \
+        DRI_CONF_DESC(en,gettext("Report LLVM 9.0.1 for games that apply shader workarounds if missing (for ACO only)")) \
+DRI_CONF_OPT_END