cmd/link: put runtime.findfunctab in the .gopclntab section

There is a test for this in CL 721461 later in this series.

For #76038

Change-Id: I15f9a8d0d5bd9424702a9ca7febb2fa76035aaf8
Reviewed-on: https://go-review.googlesource.com/c/go/+/719743
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Florian Lehner <lehner.florian86@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

Author: ianlancetaylor

src/cmd/link/internal/ld/pcln.go

@@ -1075,7 +1075,7 @@ func (ctxt *Link) findfunctab(state *pclntab, container loader.Bitmap) {
 		}
 	}
 
-	state.findfunctab = ctxt.createGeneratorSymbol("runtime.findfunctab", 0, sym.SRODATA, size, writeFindFuncTab)
+	state.findfunctab = ctxt.createGeneratorSymbol("runtime.findfunctab", 0, sym.SPCLNTAB, size, writeFindFuncTab)
 	ldr.SetAttrReachable(state.findfunctab, true)
 	ldr.SetAttrLocal(state.findfunctab, true)
 }