runtime: set GOEXPERIMENT=runtimefreegc to disabled by default

This CL is part of a set of CLs that attempt to reduce how much work the
GC must do. See the design in https://go.dev/design/74299-runtime-freegc

The plan has been for GOEXPERIMENT=runtimefreegc to be disabled
by default for Go 1.26, so here we disable it.

Also, we update the name of the GOEXPERIMENT to reflect the latest name.

Updates #74299

Change-Id: I94a34784700152e13ca93ef6711ee9b7f1769d9a
Reviewed-on: https://go-review.googlesource.com/c/go/+/720120
Reviewed-by: Junyang Shao <shaojunyang@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>

6 files changed, 18 insertions, 19 deletions

diff --git a/src/internal/buildcfg/exp.go b/src/internal/buildcfg/exp.go
index 31195f94c0..f1a1d8632e 100644
--- a/src/internal/buildcfg/exp.go
+++ b/src/internal/buildcfg/exp.go
@@ -83,7 +83,6 @@ func ParseGOEXPERIMENT(goos, goarch, goexp string) (*ExperimentFlags, error) {
 		RegabiArgs:            regabiSupported,
 		Dwarf5:                dwarf5Supported,
 		RandomizedHeapBase64:  true,
-		RuntimeFree:           true,
 		SizeSpecializedMalloc: true,
 		GreenTeaGC:            true,
 	}
diff --git a/src/internal/goexperiment/exp_runtimefree_off.go b/src/internal/goexperiment/exp_runtimefree_off.go
deleted file mode 100644
index 3affe434f2..0000000000
--- a/src/internal/goexperiment/exp_runtimefree_off.go
+++ /dev/null
@@ -1,8 +0,0 @@
-// Code generated by mkconsts.go. DO NOT EDIT.
-
-//go:build !goexperiment.runtimefree
-
-package goexperiment
-
-const RuntimeFree = false
-const RuntimeFreeInt = 0
diff --git a/src/internal/goexperiment/exp_runtimefree_on.go b/src/internal/goexperiment/exp_runtimefree_on.go
deleted file mode 100644
index 176278b542..0000000000
--- a/src/internal/goexperiment/exp_runtimefree_on.go
+++ /dev/null
@@ -1,8 +0,0 @@
-// Code generated by mkconsts.go. DO NOT EDIT.
-
-//go:build goexperiment.runtimefree
-
-package goexperiment
-
-const RuntimeFree = true
-const RuntimeFreeInt = 1
diff --git a/src/internal/goexperiment/exp_runtimefreegc_off.go b/src/internal/goexperiment/exp_runtimefreegc_off.go
new file mode 100644
index 0000000000..195f031b0b
--- /dev/null
+++ b/src/internal/goexperiment/exp_runtimefreegc_off.go
@@ -0,0 +1,8 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build !goexperiment.runtimefreegc
+
+package goexperiment
+
+const RuntimeFreegc = false
+const RuntimeFreegcInt = 0
diff --git a/src/internal/goexperiment/exp_runtimefreegc_on.go b/src/internal/goexperiment/exp_runtimefreegc_on.go
new file mode 100644
index 0000000000..2afe0558ec
--- /dev/null
+++ b/src/internal/goexperiment/exp_runtimefreegc_on.go
@@ -0,0 +1,8 @@
+// Code generated by mkconsts.go. DO NOT EDIT.
+
+//go:build goexperiment.runtimefreegc
+
+package goexperiment
+
+const RuntimeFreegc = true
+const RuntimeFreegcInt = 1
diff --git a/src/internal/goexperiment/flags.go b/src/internal/goexperiment/flags.go
index b3a3c8a497..957c41c0f5 100644
--- a/src/internal/goexperiment/flags.go
+++ b/src/internal/goexperiment/flags.go
@@ -113,8 +113,8 @@ type Flags struct {
 	// platforms.
 	RandomizedHeapBase64 bool
 
-	// RuntimeFree enables the runtime to free and reuse memory more eagerly in some circumstances with compiler help.
-	RuntimeFree bool
+	// RuntimeFreegc enables the runtime to free and reuse memory more eagerly in some circumstances with compiler help.
+	RuntimeFreegc bool
 
 	// SizeSpecializedMalloc enables malloc implementations that are specialized per size class.
 	SizeSpecializedMalloc bool