Add UAV (image) binding offset and HLSL register support
This PR adds:
1. The "u" register class for RW* objects.
2. --shift-image-bindings (== --sib), analogous to --shift-texture-bindings etc.
3. Case insensitive reg classes.
4. Tests for above.
diff --git a/Test/baseResults/spv.rw.autoassign.frag.out b/Test/baseResults/spv.rw.autoassign.frag.out
new file mode 100644
index 0000000..851ef46
--- /dev/null
+++ b/Test/baseResults/spv.rw.autoassign.frag.out
@@ -0,0 +1,70 @@
+spv.rw.autoassign.frag
+
+Linked fragment stage:
+
+
+// Module Version 10000
+// Generated by (magic number): 80001
+// Id's are bound by 37
+
+ Capability Shader
+ Capability Sampled1D
+ Capability SampledBuffer
+ 1: ExtInstImport "GLSL.std.450"
+ MemoryModel Logical GLSL450
+ EntryPoint Fragment 4 "main" 33
+ ExecutionMode 4 OriginUpperLeft
+ Name 4 "main"
+ Name 8 "r00"
+ Name 11 "g_tTex1df1"
+ Name 18 "r01"
+ Name 21 "g_tBuf1du1"
+ Name 25 "PS_OUTPUT"
+ MemberName 25(PS_OUTPUT) 0 "Color"
+ Name 27 "psout"
+ Name 33 "Color"
+ Decorate 11(g_tTex1df1) DescriptorSet 0
+ Decorate 11(g_tTex1df1) Binding 20
+ Decorate 21(g_tBuf1du1) DescriptorSet 0
+ Decorate 21(g_tBuf1du1) Binding 21
+ Decorate 33(Color) Location 0
+ 2: TypeVoid
+ 3: TypeFunction 2
+ 6: TypeFloat 32
+ 7: TypePointer Function 6(float)
+ 9: TypeImage 6(float) 1D nonsampled format:R32f
+ 10: TypePointer UniformConstant 9
+ 11(g_tTex1df1): 10(ptr) Variable UniformConstant
+ 13: TypeInt 32 1
+ 14: 13(int) Constant 0
+ 16: TypeInt 32 0
+ 17: TypePointer Function 16(int)
+ 19: TypeImage 16(int) Buffer nonsampled format:R32ui
+ 20: TypePointer UniformConstant 19
+ 21(g_tBuf1du1): 20(ptr) Variable UniformConstant
+ 24: TypeVector 6(float) 4
+ 25(PS_OUTPUT): TypeStruct 24(fvec4)
+ 26: TypePointer Function 25(PS_OUTPUT)
+ 28: 6(float) Constant 0
+ 29: 24(fvec4) ConstantComposite 28 28 28 28
+ 30: TypePointer Function 24(fvec4)
+ 32: TypePointer Output 24(fvec4)
+ 33(Color): 32(ptr) Variable Output
+ 4(main): 2 Function None 3
+ 5: Label
+ 8(r00): 7(ptr) Variable Function
+ 18(r01): 17(ptr) Variable Function
+ 27(psout): 26(ptr) Variable Function
+ 12: 9 Load 11(g_tTex1df1)
+ 15: 6(float) ImageRead 12 14
+ Store 8(r00) 15
+ 22: 19 Load 21(g_tBuf1du1)
+ 23: 16(int) ImageRead 22 14
+ Store 18(r01) 23
+ 31: 30(ptr) AccessChain 27(psout) 14
+ Store 31 29
+ 34: 30(ptr) AccessChain 27(psout) 14
+ 35: 24(fvec4) Load 34
+ Store 33(Color) 35
+ Return
+ FunctionEnd