Added several abuses of OpName and OpMemberName

Added several abuses of OpName and OpMemberName

Added tests that do various things with OpName and OpMemberName that the
implementations might not expect, including long names, UTF-8 corner
cases, overlapping naming, etc.

New tests:

dEQP-VK.spirv_assembly.instruction.compute.opname.abuse.*
dEQP-VK.spirv_assembly.instruction.compute.opmembername.abuse.*
dEQP-VK.spirv_assembly.instruction.graphics.opname_abuse.*
dEQP-VK.spirv_assembly.instruction.graphics.opmembername_abuse.*

Components: Vulkan

VK-GL-CTS issue: 1309

Change-Id: I077df4282693542aa9edb715a51c87b79384b8b9