runtime: build panic32.go on amd64p32

Fixes https://gcc.gnu.org/PR104149

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/380054
diff --git a/gcc/go/gofrontend/MERGE b/gcc/go/gofrontend/MERGE
index 9cc6a1c..a42d88d 100644
--- a/gcc/go/gofrontend/MERGE
+++ b/gcc/go/gofrontend/MERGE
@@ -1,4 +1,4 @@
-799e9807c36fc661b14dfff136369556f09a5ebf
+7d510bf5fcec9b0ccc0282f4193a80c0a164df63
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.
diff --git a/libgo/go/runtime/panic32.go b/libgo/go/runtime/panic32.go
index a2bf7e8..11d2a84 100644
--- a/libgo/go/runtime/panic32.go
+++ b/libgo/go/runtime/panic32.go
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build 386 || arm || mips || mipsle || armbe || m68k || nios2 || ppc || riscv || s390 || sh || shbe || sparc
-// +build 386 arm mips mipsle armbe m68k nios2 ppc riscv s390 sh shbe sparc
+//go:build 386 || amd64p32 || arm || mips || mipsle || armbe || m68k || nios2 || ppc || riscv || s390 || sh || shbe || sparc
+// +build 386 amd64p32 arm mips mipsle armbe m68k nios2 ppc riscv s390 sh shbe sparc
 
 package runtime