SPV: Add SPIRV-Tools validator. This needs the latest SPIR-Tools.

Test/baseResults/hlsl.constructimat.frag.out

@@ -543,6 +543,10 @@ gl_FragCoord origin is upper left
 0:?   Linker Objects
 0:?     '@entryPointOutput' (layout( location=0) out int)
 
+error: SPIRV-Tools Validation Errors
+error: Matrix types can only be parameterized with floating-point types.
+  %mat4v4int = OpTypeMatrix %v4int 4
+
 // Module Version 10000
 // Generated by (magic number): 80007
 // Id's are bound by 98