all: copy cmd/ld/textflag.h into pkg/GOOS_GOARCH
The file is used by assembly code to define symbols like NOSPLIT. Having it hidden inside the cmd directory makes it hard to access outside the standard repository. Solution: As with a couple of other files used by cgo, copy the file into the pkg directory and add a -I argument to the assembler to access it. Thus one can write just #include "textflag.h" in .s files. The names in runtime are not updated because in the boot sequence the file has not been copied yet when runtime is built. All other .s files in the repository are updated. Changes to doc/asm.html, src/cmd/dist/build.c, and src/cmd/go/build.go are hand-made. The rest are just the renaming done by a global substitution. (Yay sam). LGTM=rsc R=rsc CC=golang-codereviews https://golang.org/cl/128050043
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