llvm: Fix build with c++17

Fixes
/benchmark_register.h:17:30: error: 'numeric_limits' is not a member of 'std'
|   static const T kmax = std::numeric_limits<T>::max();
|                              ^~~~~~~~~~~~~~

(From OE-Core rev: e093eff9d94c02939ca398d59d66d1b1dbc8a12e)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/llvm/llvm/0001-nfc-Fix-missing-include.patch

@@ -0,0 +1,26 @@
+From 3b7e611bd58ba842470d17374c550e14bceca5c7 Mon Sep 17 00:00:00 2001
+From: serge-sans-paille <sguelton@redhat.com>
+Date: Tue, 10 Nov 2020 14:55:25 +0100
+Subject: [PATCH] [nfc] Fix missing include
+
+Upstream-Status: Backport [https://github.com/llvm/llvm-project/commit/b498303066a63a203d24f739b2d2e0e56dca70d1]
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+ llvm/utils/benchmark/src/benchmark_register.h | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/llvm/utils/benchmark/src/benchmark_register.h b/llvm/utils/benchmark/src/benchmark_register.h
+index 0705e219f2fa..4caa5ad4da07 100644
+--- a/llvm/utils/benchmark/src/benchmark_register.h
++++ b/llvm/utils/benchmark/src/benchmark_register.h
+@@ -1,6 +1,7 @@
+ #ifndef BENCHMARK_REGISTER_H
+ #define BENCHMARK_REGISTER_H
+ 
++#include <limits>
+ #include <vector>
+ 
+ #include "check.h"
+-- 
+2.30.1
+

meta/recipes-devtools/llvm/llvm_git.bb

@@ -34,6 +34,7 @@ SRC_URI = "git://github.com/llvm/llvm-project.git;branch=${BRANCH} \
            file://0006-llvm-TargetLibraryInfo-Undefine-libc-functions-if-th.patch;striplevel=2 \
            file://0007-llvm-allow-env-override-of-exe-path.patch;striplevel=2 \
            file://0001-AsmMatcherEmitter-sort-ClassInfo-lists-by-name-as-we.patch;striplevel=2 \
+           file://0001-nfc-Fix-missing-include.patch;striplevel=2 \
            "
 
 UPSTREAM_CHECK_GITTAGREGEX = "llvmorg-(?P<pver>\d+(\.\d+)+)"