Update to the 20200621 snapshot of GCC 11.0.0.

Temporarily add files/patch-PR95805 to address the GCC failing the
build with clang.

lang/gcc11-devel/Makefile

@@ -2,7 +2,7 @@
 # $FreeBSD$
 
 PORTNAME=	gcc
-PORTVERSION=	11.0.0.s20200614
+PORTVERSION=	11.0.0.s20200621
 CATEGORIES=	lang
 MASTER_SITES=	GCC/snapshots/${DIST_VERSION}
 PKGNAMESUFFIX=	${SUFFIX}-devel

lang/gcc11-devel/distinfo

@@ -1,3 +1,3 @@
-TIMESTAMP = 1592293522
+TIMESTAMP = 1592784068
-SHA256 (gcc-11-20200614.tar.xz) = 40635ce0e16ad628ea195270923b2bcbbcb6e1e552e0a18dfc1a9c49f286a741
+SHA256 (gcc-11-20200621.tar.xz) = ac7566828cba717b23e0a954ac72dff9fa39cddbaa9beb03a3dedf72bccec75c
-SIZE (gcc-11-20200614.tar.xz) = 71538232
+SIZE (gcc-11-20200621.tar.xz) = 71629184

lang/gcc11-devel/files/patch-PR95805

@@ -0,0 +1,47 @@
+This should be properly fixed upstream by the next snapshot.
+
+Revert commit 4e49b994de060d4a6c9318d0ed52ef038153426e
+Author: Richard Sandiford <richard.sandiford@arm.com>
+Date:   Wed Jun 17 17:45:29 2020 +0100
+
+    recog: Tweak insn_gen_fn::operator() definition
+    
+    Fixes a “left operand of comma has no effect” warning that some were
+    seeing.  Also fixes a spurious ellipsis that Jonathan Wakely pointed
+    out.
+    
+    2020-06-17  Richard Sandiford  <richard.sandiford@arm.com>
+    
+    gcc/
+            * coretypes.h (first_type): New alias template.
+            * recog.h (insn_gen_fn::operator()): Use it instead of a decltype.
+            Remove spurious “...” and split the function type out into a typedef.
+
+--- gcc/coretypes.h	2020-06-21 22:32:12.000000000 +0000
++++ gcc/coretypes.h	2020-06-23 18:56:41.074951000 +0000
+@@ -359,10 +359,6 @@
+   const ValueType value;	/* the value of the name */
+ };
+ 
+-/* Alias of the first type, ignoring the second.  */
+-template<typename T1, typename T2>
+-using first_type = T1;
+-
+ /* Iterator pair used for a collection iteration with range-based loops.  */
+ 
+ template<typename T>
+--- gcc/recog.h
++++ gcc/recog.h
+@@ -295,10 +295,9 @@ struct insn_gen_fn
+   typedef void (*stored_funcptr) (void);
+ 
+   template<typename ...Ts>
+-  rtx_insn *operator() (Ts... args) const
++  rtx_insn *operator() (Ts... args...) const
+   {
+-    typedef rtx_insn *(*funcptr) (first_type<rtx, Ts>...);
+-    return ((funcptr) func) (args...);
++    return ((rtx_insn *(*) (decltype(args, NULL_RTX)...)) func) (args...);
+   }
+ 
+   // This is for compatibility of code that invokes functions like