Parameter types misaligned in static member functions

[simoll]

The parameter type in static member functions is off-by-one leading to invalid AST dumps such as this one (from hitobject_make.hlsl):

| | |-FunctionTemplateDecl {{[^ ]+}} <<invalid sloc>> <invalid sloc> MakeMiss
| | | |-TemplateTypeParmDecl {{[^ ]+}} <<invalid sloc>> <invalid sloc> class TResult
| | | |-TemplateTypeParmDecl {{[^ ]+}} <<invalid sloc>> <invalid sloc> class TRayFlags
| | | |-TemplateTypeParmDecl {{[^ ]+}} <<invalid sloc>> <invalid sloc> class TMissShaderIndex
| | | |-TemplateTypeParmDecl {{[^ ]+}} <<invalid sloc>> <invalid sloc> class TRay
| | | |-CXXMethodDecl {{[^ ]+}} <<invalid sloc>> <invalid sloc> implicit MakeMiss 'TResult (TRayFlags, TMissShaderIndex, TRay) const' static
| | | | |-ParmVarDecl {{[^ ]+}} <<invalid sloc>> <invalid sloc> RayFlags 'TRayFlags'
| | | | |-ParmVarDecl {{[^ ]+}} <<invalid sloc>> <invalid sloc> MissShaderIndex 'TMissShaderIndex'
| | | | `-ParmVarDecl {{[^ ]+}} <<invalid sloc>> <invalid sloc> Ray 'TRay'
| | | `-CXXMethodDecl {{[^ ]+}} <<invalid sloc>> <invalid sloc> used MakeMiss 'dx::HitObject (unsigned int, unsigned int, RayDesc)' static
| | |   |-TemplateArgument type 'dx::HitObject'
| | |   |-TemplateArgument type 'unsigned int'
| | |   |-TemplateArgument type 'unsigned int'
| | |   |-TemplateArgument type 'RayDesc'
| | |   |-ParmVarDecl {{[^ ]+}} <<invalid sloc>> <invalid sloc> MakeMiss 'unsigned int'
| | |   |-ParmVarDecl {{[^ ]+}} <<invalid sloc>> <invalid sloc> RayFlags 'unsigned int'
| | |   |-ParmVarDecl {{[^ ]+}} <<invalid sloc>> <invalid sloc> MissShaderIndex 'RayDesc'
| | |   |-HLSLIntrinsicAttr {{[^ ]+}} <<invalid sloc>> Implicit "op" "" 387
| | |   `-AvailabilityAttr {{[^ ]+}} <<invalid sloc>> Implicit  6.9 0 0 ""

Originally notedby @tex3d in #7370 (comment)