radeonsi: enable EXT_shader_image_load_store

This depends on LLVM 10 because this needs https://reviews.llvm.org/D65283

Reviewed-by: Marek Olšák <marek.olsak@amd.com>

docs/relnotes/19.2.0.html

@@ -40,6 +40,7 @@ TBD.
 
 <ul>
 <li>GL_ARB_post_depth_coverage on radeonsi (Navi)</li>
+<li>GL_EXT_shader_image_load_store on radeonsi (with LLVM >= 10)</li>
 <li>GL_EXT_shader_samples_identical on iris and radeonsi (if using NIR)</li>
 <li>EGL_EXT_platform_device</li>
 <li>VK_EXT_queue_family_foreign for radv</li>

src/gallium/drivers/radeonsi/si_get.c

@@ -339,6 +339,8 @@ static int si_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
 		return sscreen->info.pci_dev;
 	case PIPE_CAP_PCI_FUNCTION:
 		return sscreen->info.pci_func;
+	case PIPE_CAP_TGSI_ATOMINC_WRAP:
+		return HAVE_LLVM >= 0x1000;
 
 	default:
 		return u_pipe_screen_get_param_defaults(pscreen, param);