BLAS.syr! incorrect when argument is SubArray

[joshday]

BLAS.syr! is incorrect when the vector argument is a view. The first element is correct, but the others are off. Here is a minimal example:

a1 = zeros(2, 2); a2 = zeros(2, 2); x = randn(5, 2);

x[1, :] * x[1,:]'
#2×2 Array{Float64,2}:
#1.80996   0.192666
#0.192666  0.0205089

BLAS.syr!('U', 1.0, x[1, :], a1)
#2×2 Array{Float64,2}:
#1.80996  0.192666
#0.0      0.0205089

BLAS.syr!('U', 1.0, view(x,1,:), a2)
#2×2 Array{Float64,2}:
#1.80996  -0.0177593
#0.0       0.000174254

And my version info:

julia> versioninfo()
Julia Version 0.5.1-pre+2
Commit f0d40ec (2016-09-20 03:34 UTC)
Platform Info:
  System: Darwin (x86_64-apple-darwin15.6.0)
  CPU: Intel(R) Core(TM) i7-4870HQ CPU @ 2.50GHz
  WORD_SIZE: 64
  BLAS: libopenblas (USE64BITINT DYNAMIC_ARCH NO_AFFINITY Haswell)
  LAPACK: libopenblas64_
  LIBM: libopenlibm
  LLVM: libLLVM-3.7.1 (ORCJIT, has well)

[timholy]

See #15308