Add test for not overdubbing pow

Author: ali-ramadhan

test/compiler.jl

@@ -12,6 +12,10 @@ end
     A[1] = 2^11
 end
 
+@kernel function square(A, B)
+    A[1] = B[1]^2
+end
+
 @kernel function checked(A, a, b)
     A[1] = Base.Checked.checked_add(a, b)
 end
@@ -28,6 +32,11 @@ function compiler_testsuite()
         @test !any(stmt->(stmt isa Expr) && stmt.head == :invoke, CI.code)
     end
 
+    let (CI, rt) = @ka_code_typed square(CPU())(zeros(1), zeros(1), ndrange=1)
+        # test that there is no invoke of overdub
+        @test !any(stmt->(stmt isa Expr) && stmt.head == :invoke, CI.code)
+    end
+
     if VERSION >= v"1.5"
         let (CI, rt) = @ka_code_typed checked(CPU())(zeros(Int,1), 1, 2, ndrange=1)
             # test that there is no invoke of overdub