runtime: make gc and scheduler asserts settable with build tags

src/runtime/build_asserts.go

@@ -0,0 +1,9 @@
+//go:build runtime_asserts
+
+package runtime
+
+// enable assertions for the garbage collector
+const gcAsserts = true
+
+// enable asserts for the scheduler
+const schedulerAsserts = true

src/runtime/build_noasserts.go

@@ -0,0 +1,9 @@
+//go:build !runtime_asserts
+
+package runtime
+
+// disable assertions for the garbage collector
+const gcAsserts = false
+
+// disable assertions for the scheduler
+const schedulerAsserts = false

src/runtime/gc_conservative.go

@@ -37,11 +37,7 @@ import (
 	"unsafe"
 )
 
-// Set gcDebug to true to print debug information.
-const (
-	gcDebug   = false   // print debug info
-	gcAsserts = gcDebug // perform sanity checks
-)
+const gcDebug = false
 
 // Some globals + constants for the entire GC.
 

src/runtime/gc_leaking.go

@@ -11,8 +11,6 @@ import (
 	"unsafe"
 )
 
-const gcAsserts = false // perform sanity checks
-
 // Ever-incrementing pointer: no memory is freed.
 var heapptr = heapStart
 

src/runtime/gc_none.go

@@ -11,8 +11,6 @@ import (
 	"unsafe"
 )
 
-const gcAsserts = false // perform sanity checks
-
 var gcTotalAlloc uint64 // for runtime.MemStats
 var gcMallocs uint64
 var gcFrees uint64