Increase stack size on windows for tests
Increase stack size on windows for tests

Now 8MB, up from the default of 1MB


Former-commit-id: 505f160b7465d96a348b68fa3a1dc7e19fd61dad
darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide