Recognize ExtInstWithForwardRefsKHR

reference/shaders-no-opt/comp/ext-inst-with-forward-refs.gV.vk.nocompat.comp.vk

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+#version 450
+#extension GL_EXT_buffer_reference2 : require
+layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
+
+layout(buffer_reference) buffer Blah;
+layout(buffer_reference) buffer Foo;
+layout(buffer_reference, buffer_reference_align = 8, std430) buffer Blah
+{
+    Foo foo;
+    int a;
+};
+
+layout(buffer_reference, std430) buffer Foo
+{
+    int b;
+};
+
+layout(push_constant, std430) uniform Registers
+{
+    Blah blah;
+} _61;
+
+void main()
+{
+    _61.blah.a = 10;
+}
+

shaders-no-opt/comp/ext-inst-with-forward-refs.gV.vk.nocompat.comp

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+#version 450
+#extension GL_EXT_buffer_reference : require
+layout(local_size_x = 1) in;
+
+layout(buffer_reference) buffer Blah;
+layout(buffer_reference) buffer Foo;
+
+layout(buffer_reference) buffer Blah
+{
+	Foo foo;
+	int a;
+};
+
+layout(buffer_reference) buffer Foo
+{
+	int b;
+};
+
+layout(push_constant) uniform Registers { Blah blah; };
+
+void main()
+{
+	blah.a = 10;
+}