[dev.typeparams] all: merge master (fdab5be1) into dev.typeparams

Two non-conflict changes included because they're needed for all.bash:

1. Bump internal/goversion.Version to 18. This will happen eventually
anyway (dev.typeparams will not be merged back to Go 1.17), and is
needed for cmd/api to allow new API additions.

2. Add fixedbugs/issue46725.go (new test added on master) to the list
of known failures for -G=3. This test exercises a bug that was fixed
in typecheck, but -G=3 mode has duplicated that code and will need to
be fixed as well. That's outside of the scope of a merge.

Conflicts:

- src/runtime/traceback.go

  Nearby lines were removed on both master and dev.typeparams.

Merge List:

+ 2021-06-14 fdab5be1 doc/go1.17: further revise OpenBSD release notes
+ 2021-06-14 326ea438 cmd/compile: rewrite a, b = f() to use temporaries when type not identical
+ 2021-06-14 3249b645 cmd/compile: factor out rewrite multi-valued f()
+ 2021-06-13 14305bf0 misc/cgo: generate Windows import libraries for clang
+ 2021-06-13 24cff0f0 cmd/go, misc/cgo: skip test if no .edata
+ 2021-06-13 67b1b6a2 cmd/compile: allow ir.OSLICE2ARRPTR in mayCall
+ 2021-06-12 1ed0d129 runtime: testprogcgo: don't call exported Go functions directly from Go
+ 2021-06-12 9d46ee5a reflect: handle stack-to-register translation in callMethod
+ 2021-06-11 e552a6d3 cmd/go: remove hint when no module is suggested
+ 2021-06-11 16b5d766 syscall: do not load native libraries on non-native powershell on arm
+ 2021-06-11 77aa209b runtime: loop on EINTR in macOS sigNoteSleep
+ 2021-06-11 e2dc6dd5 doc/go1.17: clean up formatting of gofmt section
+ 2021-06-11 2f112846 cmd/go: match Windows paths in TestScript/mod_invalid_version
+ 2021-06-11 2721da26 doc/go1.17: fix formatting near httptest
+ 2021-06-10 770f1de8 net/http: remove test-only private key from production binaries
+ 2021-06-10 8d11b1d1 cmd/go: report the imports of CompiledGoFiles in ImportMap
+ 2021-06-10 dc00dc6c crypto/tls: let HTTP/1.1 clients connect to servers with NextProtos "h2"
+ 2021-06-09 27f83723 api: promote next to go1.17
+ 2021-06-09 182157c8 doc/go1.17: remove lingering TODO
+ 2021-06-09 a5bc060b doc/go1.17: document strconv changes for Go 1.17
+ 2021-06-09 1402b27d strconv: document parsing of leading +/-
+ 2021-06-09 df35ade0 doc/go1.17: document //go:build lines
+ 2021-06-09 e4e7807d net/http: add AllowQuerySemicolons
+ 2021-06-09 ec3026d0 doc/go1.17: remove TODO for ports section
+ 2021-06-09 e6dda198 net/url: reject query values with semicolons
+ 2021-06-09 139e935d math/big: comment division
+ 2021-06-09 aa5540cd cmd/compile: make map.zero symbol content-addressable
+ 2021-06-09 07ca28d5 cmd/link: fix bug in -strictdups checking of BSS symbols
+ 2021-06-08 bcecae2a doc/go1.17: mention new possibility of type conversion panicking
+ 2021-06-08 63dcab2e doc/go1.17: mention new vet checks sigchanyzer and stdmethods.
+ 2021-06-08 6551763a doc/go1.17: mention block profile bias fix
+ 2021-06-08 cb80937b Revert "doc/go1.17: mention block profile bias fix"
+ 2021-06-08 d3e3d036 net: reject leading zeros in IP address parsers
+ 2021-06-08 da4a6401 doc/go1.17: revise OpenBSD release notes
+ 2021-06-08 689f4c74 doc/go1.17: mention block profile bias fix
+ 2021-06-08 9afe071c doc/go1.17: remove TODO for Tools section
+ 2021-06-08 f753d722 doc/go1.17: resolve TODO for cmd/cover
+ 2021-06-08 9498b015 cmd/go: in Go 1.17+ modules, add indirect go.mod dependencies separately from direct ones
+ 2021-06-08 949f00ce doc/go1.17: add release notes for crypto packages
+ 2021-06-08 0fb3e2c1 doc/go1.17: add a release note for the '-compat' flag to 'go mod tidy'
+ 2021-06-08 2169deb3 cmd/compile: use t.AllMethods when sorting typesByString
+ 2021-06-08 c20bcb64 runtime: remove out-of-date comments about frame skipping
+ 2021-06-07 39c39ae5 doc: document Go 1.17 language changes
+ 2021-06-07 dc8b5589 cmd/dist: pass -Wno-lto-type-mismatch in swig_callback_lto
+ 2021-06-07 909dd5e0 strconv: ParseFloat: always return ErrSyntax for bad syntax

Change-Id: Iffdf379d0275bbd12d50149ce38634773ced481d