Added a third batch of coverage tests found by GraphicsFuzz

Added a third batch of coverage tests found by GraphicsFuzz

New tests:

dEQP-VK.graphicsfuzz.cov-analysis-reachable-from-many
dEQP-VK.graphicsfuzz.cov-apfloat-acos-ldexp
dEQP-VK.graphicsfuzz.cov-const-folding-gte-const-first
dEQP-VK.graphicsfuzz.cov-fold-negate-min-int-value
dEQP-VK.graphicsfuzz.cov-folding-merge-add-sub-uniform
dEQP-VK.graphicsfuzz.cov-folding-rules-merge-var-sub
dEQP-VK.graphicsfuzz.cov-folding-rules-mix-uniform-weight
dEQP-VK.graphicsfuzz.cov-folding-rules-negate-sub
dEQP-VK.graphicsfuzz.cov-folding-rules-vec-mix-uniform
dEQP-VK.graphicsfuzz.cov-inc-inside-switch-and-for
dEQP-VK.graphicsfuzz.cov-irbuilder-matrix-cell-uniform
dEQP-VK.graphicsfuzz.cov-mem-pass-sum-struct-members
dEQP-VK.graphicsfuzz.cov-mem-pass-unused-component
dEQP-VK.graphicsfuzz.cov-pattern-match-signum
dEQP-VK.graphicsfuzz.cov-pattern-match-single-bit
dEQP-VK.graphicsfuzz.cov-replace-copy-object
dEQP-VK.graphicsfuzz.cov-scaled-number-nested-loops
dEQP-VK.graphicsfuzz.cov-set-vector-cos-fragcoord
dEQP-VK.graphicsfuzz.cov-simplification-unused-struct
dEQP-VK.graphicsfuzz.cov-single-store-elim-assume-store
dEQP-VK.graphicsfuzz.cov-target-lowering-dfdx-cos
dEQP-VK.graphicsfuzz.cov-val-cfg-case-fallthrough
dEQP-VK.graphicsfuzz.cov-wrap-op-kill-for-loop
dEQP-VK.graphicsfuzz.cov-wrap-op-kill-two-branches

Components: Vulkan
Change-Id: I50b2813f9d7810151dbfe23170648c32db8c397c