clang-tidy: performance-unnecessary-value-param#19870

Merged

minggo merged 3 commits intococos2d:v3from

JohnCoconut:clang-tidy-performance-unnecessary-value-param-new

Jul 3, 2019

Commits on Jun 26, 2019

clang-tidy: performance-unnecessary-value-param
JohnCoconut
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Commits on Jun 27, 2019

Reference: https://releases.llvm.org/7.0.0/tools/clang/tools/extra/docs/clang-tidy/checks/performance-unnecessary-value-param.html
JohnCoconut
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Commits on Jul 2, 2019

perfer pass by const reference
JohnCoconut
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