Disable the heap search in priority_queue::upper_bound
Disable the heap search in priority_queue::upper_bound

Heap search is broken for some cases. Replace with exhaustive search on
m_queue for now.

Change-Id: I40466cc2edf4c13b67b0bc440833ac88eabdf10f

[git-p4: depot-paths = "//sw/gpgpu/nvbio/main/": change = 18360486]

NVlabs/nvbio,kimrutherford/nvbio,NVlabs/nvbio,NVlabs/nvbio,kimrutherford/nvbio,NVlabs/nvbio,kimrutherford/nvbio,kimrutherford/nvbio