[SPIRV] FIX print the symbolic operand for opcode for the operation OpSpecConstantOp (#135756)
Current implementation outputs opcode is an immediate but spirv-tools
requires that the name of the operation without "Op" is needed for the
instruction OpSpecConstantOp
that is if the opcode is OpBitcast the instruction must be
`%1 = OpSpecConstantOp %6 Bitcast %17`
instead of
`%1 = OpBitcast %6 124 %17`
[refer this commit for more
info](https://github.com/KhronosGroup/SPIRV-Tools/commit/0f166be68d4b6624a10d6bf312679505d391ec22)
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Co-authored-by: Dmitry Sidorov <dmitry.sidorov@intel.com>
Co-authored-by: Ebin-McW <ebin.jose@multicorewareinc.com>