Pure Texture to Sampled Texture Transform

Adds a transformation step to the post processing step.
Two modes are available:
1) keep
- Keeps samplers, textures and sampled textures as is
2) transform pure texture into sampled texture and remove pure samplers
- removes all pure samplers
- transforms all pure textures into its sampled counter part

Change-Id: If54972e8052961db66c23f4b7e719d363cf6edbd

Test/baseResults/spv.texture.sampler.transform.frag.out

@@ -0,0 +1,38 @@
+spv.texture.sampler.transform.frag
+Warning, version 440 is not yet complete; most version-specific features are present, but some are missing.
+
+// Module Version 10000
+// Generated by (magic number): 80001
+// Id's are bound by 19
+
+                              Capability Shader
+               1:             ExtInstImport  "GLSL.std.450"
+                              MemoryModel Logical GLSL450
+                              EntryPoint Fragment 4  "main" 9 16
+                              ExecutionMode 4 OriginUpperLeft
+                              Source GLSL 440
+                              Name 4  "main"
+                              Name 9  "color"
+                              Name 12  "tex"
+                              Name 16  "coord"
+                              Decorate 12(tex) DescriptorSet 0
+               2:             TypeVoid
+               3:             TypeFunction 2
+               6:             TypeFloat 32
+               7:             TypeVector 6(float) 4
+               8:             TypePointer Output 7(fvec4)
+        9(color):      8(ptr) Variable Output
+              10:             TypeImage 6(float) 2D sampled format:Unknown
+              11:             TypePointer UniformConstant 10
+         12(tex):     11(ptr) Variable UniformConstant
+              14:             TypeVector 6(float) 2
+              15:             TypePointer Input 14(fvec2)
+       16(coord):     15(ptr) Variable Input
+         4(main):           2 Function None 3
+               5:             Label
+              13:          10 Load 12(tex)
+              17:   14(fvec2) Load 16(coord)
+              18:    7(fvec4) ImageSampleImplicitLod 13 17
+                              Store 9(color) 18
+                              Return
+                              FunctionEnd

Test/spv.texture.sampler.transform.frag

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+#version 440
+
+uniform sampler smp;
+uniform texture2D tex;
+
+in vec2 coord;
+
+out vec4 color;
+
+void main()
+{
+  color = texture(sampler2D(tex, smp), coord);
+}