[Coverity] Copy instead of move

[AlexeySachkov]

See issues at https://scan.coverity.com/projects/intel-llvm?tab=overview

CID 489856:

https://github.com/KhronosGroup/SPIRV-LLVM-Translator/blame/590068b12402262dd9bd0aa1386f2e89babfa8a1/lib/SPIRV/SPIRVWriter.cpp#L2430

CID 489869:

https://github.com/KhronosGroup/SPIRV-LLVM-Translator/blame/590068b12402262dd9bd0aa1386f2e89babfa8a1/lib/SPIRV/SPIRVWriter.cpp#L6425

CID 490409:

This one looks a bit weird to me, not sure if its a valid hit:

https://github.com/KhronosGroup/SPIRV-LLVM-Translator/blame/590068b12402262dd9bd0aa1386f2e89babfa8a1/lib/SPIRV/SPIRVWriter.cpp#L5148

CID 490034:

SPIRV-LLVM-Translator/lib/SPIRV/libSPIRV/SPIRVEntry.cpp

Line 637 in 590068b

ExecModel(TheExecModel), Name(TheName), Variables(Variables) {}

CID 490504:

SPIRV-LLVM-Translator/lib/SPIRV/libSPIRV/SPIRVInstruction.h

Line 1197 in 590068b

LoopControlParameters(TheLoopControlParameters) {

CID 490545:

SPIRV-LLVM-Translator/lib/SPIRV/libSPIRV/SPIRVInstruction.h

Line 1804 in 590068b

LoopControlParameters(TheLoopControlParameters) {

CID 489914:

SPIRV-LLVM-Translator/lib/SPIRV/libSPIRV/SPIRVModule.cpp

Line 718 in 590068b

SPIRVExt.insert(ExtName);

CID 490348:

SPIRV-LLVM-Translator/lib/SPIRV/libSPIRV/SPIRVUtil.h

Line 164 in 590068b

RevMap[V2] = V1;

CID 439509:

SPIRV-LLVM-Translator/lib/SPIRV/libSPIRV/SPIRVUtil.h

Line 167 in 590068b

Map[V1] = V2;

CID 489584:

SPIRV-LLVM-Translator/lib/SPIRV/libSPIRV/SPIRVValue.h

Line 310 in 590068b

Elements = getIds(TheElements);