Fix invalid SPIR-V in GraphicsFuzz tests

Fix invalid SPIR-V in GraphicsFuzz tests

Components: Vulkan

VK-GL-CTS Issue: 2122

Affected tests:

dEQP-VK.graphicsfuzz.continue-and-merge
dEQP-VK.graphicsfuzz.control-flow-switch
dEQP-VK.graphicsfuzz.discard-continue-return
dEQP-VK.graphicsfuzz.fragcoord-control-flow-2
dEQP-VK.graphicsfuzz.fragcoord-control-flow
dEQP-VK.graphicsfuzz.loop-call-discard
dEQP-VK.graphicsfuzz.mat-array-deep-control-flow
dEQP-VK.graphicsfuzz.mat-array-distance
dEQP-VK.graphicsfuzz.return-in-loop-in-function
dEQP-VK.graphicsfuzz.unreachable-continue-statement

Change-Id: Iaa7448ee4a815d9e3a1c8a5582214ecd599ac143
(cherry picked from commit 46bcbf639d7bd79f630587fdc951dfa2ee8507af)