doc: delete go1.8.txt

Fixes #20591

Change-Id: I2a4674a3430c5a4d3c569f3ea654c6ff4d9bf7ee
Reviewed-on: https://go-review.googlesource.com/45015Reviewed-by: Ian Lance Taylor <iant@golang.org>

doc/go1.8.txt

-This file lists things yet to be moved into go1.8.html or deemed too
-minor to mention. Either way, delete from here when done.
-
-Tools:
-
-go: -buildmode=c-archive now builds PIC on ELF (CL 24180)
-go: mobile pkg dir change, recommend using go list in scripts (CL 24930, CL 27929)
-go, dist: can set default pkg-config tool using PKG_CONFIG env var (CL 29991)
-go: can set secure/insecure GIT schemes using GIT_ALLOW_PROTOCOL env var (CL 30135)
-
-API additions and behavior changes:
-
-cmd/compile, runtime, etc: get rid of constant FP registers (CL 28095)
-cmd/compile, runtime: add go:yeswritebarrierrec pragma (CL 30938)
-cmd/compile/internal/gc: enable new parser by default (CL 27203)
-cmd/compile/internal/syntax: fast Go syntax trees, initial commit (CL 27195)
-cmd/compile: add compiler phase timing (CL 24462)
-cmd/compile: add inline explainer (CL 22782)
-cmd/compile: enable flag-specified dump of specific phase+function (CL 23044)
-
-cmd/internal/obj, cmd/link: darwin dynlink support (CL 29393)
-cmd/internal/objfile: add ppc64/ppc64le disassembler support (CL 9682)
-cmd/link, cmd/go: delay linking of mingwex and mingw32 until very end (CL 26670)
-cmd/link: R_ADDR dynamic relocs for internal PIE (CL 29118)
-cmd/link: add trampolines for too far calls in ppc64x (CL 30850)
-cmd/link: allow internal PIE linking (CL 28543)
-cmd/link: fix -X importpath.name=value when import path needs escaping (CL 31970)
-cmd/link: fix -buildmode=pie / -linkshared combination (CL 28996)
-cmd/link: for -buildmode=exe pass -no-pie to external linker (CL 33106)
-cmd/link: insert trampolines for too-far jumps on ARM (CL 29397)
-cmd/link: non-executable stack support for Solaris (CL 24142)
-cmd/link: put text at address 0x1000000 on darwin/amd64 (CL 32185)
-cmd/link: remove the -shared flag (CL 28852)
-cmd/link: split large elf text sections on ppc64x (CL 27790)
-cmd/link: trampoline support for external linking on ARM (CL 31143)
-cmd/objdump: implement objdump of .o files (CL 24818)
-
-go/build: allow % in ${SRCDIR} expansion for Jenkins (CL 31611)
-go/build: do not record go:binary-only-package if build tags not satisfied (CL 31577)
-go/build: implement default GOPATH (CL 32019)
-
-runtime/race: update race runtime (CL 32160)
-runtime: assume 64kB physical pages on ARM (CL 25021)
-runtime: disable stack rescanning by default (CL 31766)
-runtime: don't call cgocallback from signal handler (CL 30218)
-runtime: fix check for vacuous page boundary rounding (CL 27230)
-runtime: fix map iterator concurrent map check (CL 24749)
-runtime: fix newextram PC passed to race detector (CL 29712)
-runtime: implement unconditional hybrid barrier (CL 31765)
-runtime: include pre-panic/throw logs in core dumps (CL 32013)
-runtime: limit the number of map overflow buckets (CL 25049)
-runtime: pass windows float syscall args via XMM (CL 32173)
-runtime: print sigcode on signal crash (CL 32183)
-runtime: record current PC for SIGPROF on non-Go thread (CL 30252)
-runtime: sleep on CLOCK_MONOTONIC in futexsleep1 on freebsd (CL 30154)