Fix storing of string constants with characters above 0x7f

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Status Job ID Name Coverage
  Build
passed #62985
build

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passed #62986
build-clang

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build-wasm

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build-windows

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  Test Interpreter
passed #62991
benchmark-wasm

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passed #62989
benchmark-x64

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passed #62990
benchmark-x86

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  Test Interworking
passed #62993
interworking-GraphCopy

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passed #62994
interworking-GraphCopy-clang

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passed #62992
interworking-Start

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  Examples
passed #62995
examples

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