[dev.simd] all: merge master (39c00b1) into dev.simd

Conflicts:

- src/cmd/compile/internal/ssa/_gen/ARM64Ops.go
- src/cmd/compile/internal/ssa/_gen/WasmOps.go
- src/cmd/compile/internal/ssa/opGen.go

Merge List:

+ 2026-05-26 39c00b1ee8 time: uncomment t.Fatalf call in a test
+ 2026-05-26 a5bc606a68 runtime: remove asynctimerchan GODEBUG setting
+ 2026-05-26 c3a43395bc cmd/compile: add earlyOk to all valid ops
+ 2026-05-26 20897e5e2c cmd/compile: remove DIV special case
+ 2026-05-26 a05ea74a15 cmd/compile: test for issue 78997
+ 2026-05-26 f93424692d cmd/compile: make lifting ops out of loops opt-in instead of opt-out
+ 2026-05-26 a43897f6fe cmd/pprof: update vendored github.com/google/pprof
+ 2026-05-26 bf3d291ea3 all: update vendored dependencies
+ 2026-05-26 e61c280596 net/http: ensure the same address family for HTTP/3 test client and server
+ 2026-05-25 e28acf5506 cmd/compile: ensure evaluating array index expression
+ 2026-05-25 9c2b47b003 runtime: loosen gc memory limit test on Darwin
+ 2026-05-25 d987c2352d debug/elf: don't panic if SHN_XINDEX exceeds shnum
+ 2026-05-25 233f2ba9b2 cmd/go: return non-zero when go tool is interrupted
+ 2026-05-25 3a92cb4958 debug/dwarf: report underflow error on failure to read a varint
+ 2026-05-25 c07f0065ce encoding/gob: cap map size when decoding
+ 2026-05-25 9da73fb702 cmd/go/internal/envcmd: print a default value for GOBIN
+ 2026-05-22 24ec7d2120 runtime/metrics: ensure no stop-the-world in Read
+ 2026-05-22 5078670ed2 cmd/go/testdata/script: remove get_404_meta net dependency

Change-Id: I8b31c34b24f59d745e647493f8bd040a4d7407d7