Add support for GL_EXT_buffer_reference2

Test/spv.bufferhandle19_Errors.frag

@@ -0,0 +1,32 @@
+#version 450
+
+#extension GL_EXT_shader_explicit_arithmetic_types_int64 : enable
+#extension GL_EXT_buffer_reference2 : enable
+#extension GL_EXT_scalar_block_layout : enable
+
+layout(buffer_reference) buffer T1 {
+    int x[];
+};
+
+layout(buffer_reference) buffer T2 {
+    int x[2];
+};
+
+void main()
+{
+    T1 a;
+    a+1;
+    a-1;
+    1+a;
+    a-a;
+    a+=1;
+    a-=1;
+    a+=a;
+    a-=a;
+
+    T2 b;
+    b+=b;
+    b-=b;
+    b+b;
+    1-b;
+}