Modify testing to only record validation pass/fail

* Changed unit tests to only record known the validation pass/fail
status
 * errors are output as part of the failure message if the result is
 unexpected
 * can turn off validation for each test individually
* Moved some SPV_KHR_vulkan_memory_model tests to be compiled for Vulkan
1.1

Test/baseResults/hlsl.texture.struct.frag.out

@@ -837,10 +837,7 @@ gl_FragCoord origin is upper left
 0:?     'g_tTex2s1a' ( uniform texture2D)
 0:?     '@entryPointOutput' (layout( location=0) out 4-component vector of float)
 
-error: SPIRV-Tools Validation Errors
-error: OpStore Pointer <id> '185's type does not match Object <id> '184's type.
-  OpStore %185 %184
-
+Validation failed
 // Module Version 10000
 // Generated by (magic number): 80007
 // Id's are bound by 240