[dev.simd] all: merge master (9b2d39b) into dev.simd

Conflicts:

- src/internal/buildcfg/exp.go

Merge List:

+ 2025-09-22 9b2d39b75b cmd/compile/internal/ssa: match style and formatting
+ 2025-09-22 e23edf5e55 runtime: don't re-read metrics before check in TestReadMetricsSched
+ 2025-09-22 177cd8d763 log/slog: use a pooled json encoder
+ 2025-09-22 2353c15785 cmd/cgo/internal/test: skip TestMultipleAssign when using UCRT on Windows
+ 2025-09-22 32dfd69282 cmd/dist: disable FIPS 140-3 mode when testing maphash with purego
+ 2025-09-19 7f6ff5ec3e cmd/compile: fix doc word
+ 2025-09-19 9693b94be0 runtime: include stderr when objdump fails
+ 2025-09-19 8616981ce6 log/slog: optimize slog Level.String() to avoid fmt.Sprintf
+ 2025-09-19 b8af744360 testing: fix example for unexported identifier
+ 2025-09-19 51dc5bfe6c Revert "cmd/go: disable cgo by default if CC unset and  DefaultCC doesn't exist"
+ 2025-09-19 ee7bf06cb3 time: improve ParseDuration performance for invalid input
+ 2025-09-19 f9e61a9a32 cmd/compile: duplicate nil check to two branches of write barrier
+ 2025-09-18 3cf1aaf8b9 runtime: use futexes with 64-bit time on Linux
+ 2025-09-18 0ab038af62 cmd/compile/internal/abi: use clear built-in
+ 2025-09-18 00bf24fdca bytes: use clear in test
+ 2025-09-18 f9701d21d2 crypto: use clear built-in
+ 2025-09-18 a58afe44fa net: fix testHookCanceledDial race
+ 2025-09-18 3203a5da29 net/http: avoid connCount underflow race
+ 2025-09-18 8ca209ec39 context: don't return a non-nil from Err before Done is closed
+ 2025-09-18 3032894e04 runtime: make explicit nil check in heapSetTypeSmallHeader
+ 2025-09-17 ef05b66d61 cmd/internal/obj/riscv: add support for Zicond instructions
+ 2025-09-17 78ef487a6f cmd/compile: fix the issue of shift amount exceeding the valid range
+ 2025-09-17 77aac7bb75 runtime: don't enable heap randomization if MSAN or ASAN is enabled
+ 2025-09-17 465b85eb76 runtime: fix CheckScavengedBitsCleared with randomized heap base
+ 2025-09-17 909704b85e encoding/json/v2: fix typo in comment
+ 2025-09-17 3db5979e8c testing: use reflect.TypeAssert and reflect.TypeFor
+ 2025-09-17 6a8dbbecbf path/filepath: fix EvalSymlinks to return ENOTDIR on plan9
+ 2025-09-17 bffe7ad9f1 go/parser: Add TestBothLineAndLeadComment
+ 2025-09-17 02a888e820 go/ast: document that (*ast.File).Comments is sorted by position
+ 2025-09-16 594deca981 cmd/link: simplify PE relocations mapping
+ 2025-09-16 9df1a289ac go/parser: simplify expectSemi
+ 2025-09-16 72ba117bda internal/buildcfg: enable randomizedHeapBase64 by default
+ 2025-09-16 796ea3bc2e os/user: align test file name and build tags
+ 2025-09-16 a69395eab2 runtime/_mkmalloc: add a copy of cloneNode
+ 2025-09-16 cbdad4fc3c cmd/go: check pattern for utf8 validity before call regexp.MustCompile
+ 2025-09-16 c2d85eb999 cmd/go: disable cgo by default if CC unset and  DefaultCC doesn't exist
+ 2025-09-16 ac82fe68aa bytes,strings: remove reference to non-existent SplitFunc
+ 2025-09-16 0b26678db2 cmd/compile: fix mips zerorange implementation
+ 2025-09-16 e2cfc1eb3a cmd/internal/obj/riscv: improve handling of float point moves
+ 2025-09-16 281c632e6e crypto/x509/internal/macos: standardize package name
+ 2025-09-16 61dc7fe30d iter: document that calling yield after terminated range loop causes runtime panic

Change-Id: Ic06019efc855913632003f41eb10c746b3410b0a

diff --cc src/cmd/compile/internal/abi/abiutils.go
Simple merge

diff --cc src/cmd/dist/test.go
Simple merge

diff --cc src/internal/buildcfg/exp.go
index 734059e6d84d9131aa4af9ed72bb11a7101bd01b,707776b374b0d4fe142992834e431ab61bc7937f..b05150373b27500ffb7f749974df81093383cb5f
--- 1/src/internal/buildcfg/exp.go
--- 2/src/internal/buildcfg/exp.go
+++ b/src/internal/buildcfg/exp.go
@@@ -79,10 -79,10 +79,11 @@@ func ParseGOEXPERIMENT(goos, goarch, go
        dwarf5Supported := (goos != "darwin" && goos != "ios" && goos != "aix")
  
        baseline := goexperiment.Flags{
-               RegabiWrappers:  regabiSupported,
-               RegabiArgs:      regabiSupported,
-               SIMD:            goarch == "amd64", // TODO remove this (default to false) when dev.simd is merged
-               Dwarf5:          dwarf5Supported,
+               RegabiWrappers:       regabiSupported,
+               RegabiArgs:           regabiSupported,
++              SIMD:                 goarch == "amd64", // TODO remove this (default to false) when dev.simd is merged
+               Dwarf5:               dwarf5Supported,
+               RandomizedHeapBase64: true,
        }
  
        // Start with the statically enabled set of experiments.

diff --cc src/runtime/export_test.go
Simple merge