GLSL: Add binding map tests

This PR adds a GLSL equivalent to the HLSL binding mapping tests for offsets and auto-numbering.
The shaders are as equivalent as possible.  The bindings of the base results match exactly
between the two.

Test/spv.glsl.register.autoassign.frag

@@ -0,0 +1,68 @@
+#version 450
+
+uniform layout(binding=0) sampler       g_sSamp1;
+uniform sampler       g_sSamp2;
+uniform layout(binding=2) sampler       g_sSamp3[2];
+uniform sampler       g_sSamp4[3];
+uniform sampler       g_sSamp5;
+
+uniform sampler       g_sSamp_unused1;
+uniform sampler       g_sSamp_unused2;
+
+uniform layout(binding=1) texture1D          g_tTex1;
+uniform texture1D  g_tTex2;
+uniform layout(binding=3) texture1D          g_tTex3[2];
+uniform texture1D          g_tTex4[3];
+uniform texture1D          g_tTex5;
+
+uniform layout(binding=0)  texture1D          g_tTex_unused1;
+uniform layout(binding=2)  texture1D          g_tTex_unused2;
+uniform texture1D          g_tTex_unused3;
+
+struct MyStruct_t {
+    int a;
+    float b;
+    vec3 c;
+};
+
+uniform layout(binding=4) myblock {
+    MyStruct_t mystruct;
+    vec4 myvec4_a;
+    vec4 myvec4_b;
+    ivec4 myint4_a;
+};
+
+vec4 Func1()
+{
+    return
+        texture(sampler1D(g_tTex1, g_sSamp1), 0.1) +
+        texture(sampler1D(g_tTex2, g_sSamp2), 0.2) +
+        texture(sampler1D(g_tTex3[0], g_sSamp3[0]), 0.3) +
+        texture(sampler1D(g_tTex3[1], g_sSamp3[1]), 0.3) +
+        texture(sampler1D(g_tTex4[1], g_sSamp4[1]), 0.4) +
+        texture(sampler1D(g_tTex4[2], g_sSamp4[2]), 0.4) +
+        texture(sampler1D(g_tTex5, g_sSamp5), 0.5) +
+        mystruct.c[1];
+}
+
+vec4 Func2()
+{
+    return
+        texture(sampler1D(g_tTex1, g_sSamp1), 0.1) +
+        texture(sampler1D(g_tTex3[1], g_sSamp3[1]), 0.3);
+}
+
+// Not called from entry point:
+vec4 Func2_unused()
+{
+    return
+        texture(sampler1D(g_tTex_unused1, g_sSamp_unused1), 1.1) +
+        texture(sampler1D(g_tTex_unused2, g_sSamp_unused2), 1.2);
+}
+
+out vec4 FragColor;
+
+void main()
+{
+    FragColor = Func1() + Func2();
+}