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cmd/go: skip writing dwarf debug info for ephemeral binaries
Update #6853 For an ephemeral binary - one created, run, and then deleted - there is no need to write dwarf debug information, since the binary will not be used with gdb. In this case, instruct the linker not to spend time and disk space generating the debug information by passing the -w flag to the linker. Omitting dwarf information reduces the size of most binaries by 25%. We may be more aggressive about this in the future. LGTM=bradfitz, r R=r, bradfitz CC=golang-codereviews https://golang.org/cl/65890043
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