abseil-cpp: fix clang build with BMI2

Clang errors on a direct include of <bmi2intrin.h>

'Never use <bmi2intrin.h> directly; include <immintrin.h> instead.'

 hit whenever __BMI2__ is defined.

Backport the upstream fix to include the umbrella <immintrin.h>
header guarded by an x86 check.

Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-devtools/abseil-cpp/abseil-cpp/0003-raw_hash_set-include-immintrin.h-instead-of-bmi2intr.patch

@@ -0,0 +1,36 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Tue, 24 Jun 2026 00:00:00 +0000
+Subject: [PATCH] raw_hash_set: include <immintrin.h> instead of <bmi2intrin.h>
+
+Clang refuses a direct include of <bmi2intrin.h> and errors out with:
+
+  error: "Never use <bmi2intrin.h> directly; include <immintrin.h> instead."
+
+This is hit whenever __BMI2__ is defined, e.g. when building with
+-march=x86-64-v3. Mirror upstream and include the umbrella <immintrin.h>
+header guarded by an x86 check, which transitively provides the BMI2
+intrinsics (_bzhi_u32/_bzhi_u64) used in mask().
+
+Upstream-Status: Backport [https://github.com/abseil/abseil-cpp/commit/d851fdd768b27c02b3fb786fd0987faddd279ece]
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+ absl/container/internal/raw_hash_set.h | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+--- a/absl/container/internal/raw_hash_set.h
++++ b/absl/container/internal/raw_hash_set.h
+@@ -225,9 +225,9 @@
+ #include <ranges>  // NOLINT(build/c++20)
+ #endif
+
+-#ifdef __BMI2__
+-#include <bmi2intrin.h>
+-#endif  // __BMI2__
++#if defined(__i386__) || defined(__x86_64__)
++#include <immintrin.h>
++#endif
+
+ namespace absl {
+ ABSL_NAMESPACE_BEGIN

meta-oe/recipes-devtools/abseil-cpp/abseil-cpp_20260526.0.bb

@@ -10,6 +10,7 @@ LIC_FILES_CHKSUM = "file://LICENSE;md5=df52c6edb7adc22e533b2bacc3bd3915"
 SRC_URI = "https://github.com/abseil/${BPN}/releases/download/${PV}/${BP}.tar.gz \
            file://0001-absl-always-use-asm-sgidefs.h.patch \
            file://0002-abseil-ppc-fixes.patch \
+           file://0003-raw_hash_set-include-immintrin.h-instead-of-bmi2intr.patch \
            "
 SRC_URI[sha256sum] = "6e1aee535473414164bf83e4ebc40240dec71a4701f8a642d906e95bea1aea0c"