Move from facts render to facts validation.

This allows fact information to be validated in the underlying source files,
but requires us to explicitly maintain this in appropriate version-tagged, and
architecture-tagged files. This is more explicit and safer.

This mechanism uses a special regular expression for matching a +checkconst
stanza to validate constant values, sizes and offsets. This applies to both Go
source files and assembly files.

PiperOrigin-RevId: 511867507

pkg/hosttid/BUILD

@@ -1,30 +1,13 @@
-load("//tools:arch.bzl", "arch_genrule", "select_arch")
 load("//tools:defs.bzl", "go_library", "go_test")
-load("//tools/nogo:defs.bzl", "nogo_facts")
 
 package(licenses = ["notice"])
 
-nogo_facts(
-    name = "hosttid_impl",
-    srcs = ["hosttid.go"],
-    output = "hosttid_impl.s",
-    template = select_arch(
-        amd64 = "hosttid_amd64.s",
-        arm64 = "hosttid_arm64.s",
-    ),
-)
-
-arch_genrule(
-    name = "hosttid_impl_arch",
-    src = ":hosttid_impl",
-    template = "hosttid_impl_%s.s",
-)
-
 go_library(
     name = "hosttid",
     srcs = [
         "hosttid.go",
-        ":hosttid_impl_arch",
+        "hosttid_amd64.s",
+        "hosttid_arm64.s",
     ],
     visibility = ["//visibility:public"],
 )

pkg/hosttid/hosttid_amd64.s

@@ -17,8 +17,8 @@
 
 #include "textflag.h"
 
-#define M_OFFSET {{ .import.runtime.g.m.Offset }}
-#define PROCID_OFFSET {{ .import.runtime.m.procid.Offset }}
+#define M_OFFSET       48 // +checkoffset runtime g.m
+#define PROCID_OFFSET  72 // +checkoffset runtime m.procid
 
 TEXT ·Current(SB),NOSPLIT,$0-8
 	// procid is in getg().m.procid.

pkg/hosttid/hosttid_arm64.s

@@ -17,8 +17,8 @@
 
 #include "textflag.h"
 
-#define M_OFFSET {{ .import.runtime.g.m.Offset }}
-#define PROCID_OFFSET {{ .import.runtime.m.procid.Offset }}
+#define M_OFFSET      48 // +checkoffset runtime g.m
+#define PROCID_OFFSET 72 // +checkoffset runtime m.procid
 
 TEXT ·Current(SB),NOSPLIT,$0-8
 	// procid is in getg().m.procid.