Add support for -cl-std=CL3.0 (#653)

Always enable support for non-uniform work-groups when compiling as
CL3.0.

Signed-off-by: Kévin Petit <kpet@free.fr>
diff --git a/lib/Compiler.cpp b/lib/Compiler.cpp
index 705b2a6..590fcc0 100644
--- a/lib/Compiler.cpp
+++ b/lib/Compiler.cpp
@@ -395,6 +395,9 @@
   case clspv::Option::SourceLanguage::OpenCL_C_20:
     standard = clang::LangStandard::lang_opencl20;
     break;
+  case clspv::Option::SourceLanguage::OpenCL_C_30:
+    standard = clang::LangStandard::lang_opencl30;
+    break;
   case clspv::Option::SourceLanguage::OpenCL_CPP:
     standard = clang::LangStandard::lang_openclcpp;
     break;