Fixes for Julia 1.12 (#619)

Author: kshyatt

src/host/linalg.jl

@@ -107,7 +107,7 @@ end
 ## copy a triangular part of a matrix to another matrix
 
 if isdefined(LinearAlgebra, :copytrito!)
-    function LinearAlgebra.copytrito!(B::AbstractGPUMatrix, A::AbstractGPUMatrix, uplo::AbstractChar)
+    function LinearAlgebra.copytrito!(B::AbstractGPUMatrix{T}, A::AbstractGPUMatrix{T}, uplo::AbstractChar) where {T}
         LinearAlgebra.BLAS.chkuplo(uplo)
         m,n = size(A)
         m1,n1 = size(B)
@@ -376,6 +376,13 @@ function LinearAlgebra.generic_matmatmul!(C::AbstractGPUVecOrMat, tA, tB, A::Abs
     LinearAlgebra.@stable_muladdmul generic_matmatmul!(C, wrap(A, tA), wrap(B, tB), MulAddMul(a, b))
 end
 end
+@static if VERSION ≥ v"1.12.0-rc"
+    # we need to use the generic wrapper to avoid dispatch to the 2x2or3x3 method
+    using LinearAlgebra: generic_matmatmul_wrapper!, BlasFlag
+    function LinearAlgebra.generic_matmatmul_wrapper!(C::AbstractGPUMatrix{T}, tA::AbstractChar, tB::AbstractChar, A::AbstractGPUVecOrMat{T}, B::AbstractGPUVecOrMat{T}, alpha::Number, beta::Number, val::LinearAlgebra.BlasFlag.SyrkHerkGemm) where {T}
+        LinearAlgebra.generic_matmatmul!(C, tA, tB, A, B, alpha, beta)
+    end
+end
 
 function generic_trimatmul!(C::AbstractGPUVecOrMat{R}, uploc, isunitc, tfun::Function, A::AbstractGPUMatrix{T}, B::AbstractGPUVecOrMat{S}) where {T,S,R}
     if size(A,2) != size(B,1)