fix intrinsic-test to use core_arch::arch rather than std::arch

Author: sayantn

crates/intrinsic-test/missing_x86.txt

@@ -51,29 +51,17 @@ _mm_sm3rnds2_epi32
 # SDE ERROR: Cannot execute XGETBV with ECX != 0
 _xgetbv
 
-# Miscellaneous issues that can be fixed first
-_kshiftli_mask16
-_kshiftli_mask32
-_kshiftli_mask64
-_kshiftli_mask8
-_kshiftri_mask16
-_kshiftri_mask32
-_kshiftri_mask64
-_kshiftri_mask8
+# top bits are undefined, unclear how to test these
 _mm256_castsi128_si256
-_mm256_extract_epi16
-_mm256_extract_epi8
 _mm512_castsi128_si512
 _mm512_castsi256_si512
-# _mm512_conj_pch
+
+# Clang bug
+_mm256_extract_epi16
+_mm256_extract_epi8
 _mm512_mask_reduce_max_pd
 _mm512_mask_reduce_max_ps
 _mm512_mask_reduce_min_pd
 _mm512_mask_reduce_min_ps
-_mm_comineq_sh
 _mm_extract_epi16
 _mm_extract_epi8
-_mm_mask_cvtepi16_epi8
-_mm_mask_cvtpd_epi32
-_mm_mask_cvtpd_ps
-_mm_ucomineq_sh

crates/intrinsic-test/src/x86/config.rs

@@ -5,7 +5,7 @@ pub const NOTICE: &str = "\
 
 // Format f16 values (and vectors containing them) in a way that is consistent with C.
 pub const PLATFORM_RUST_DEFINITIONS: &str = r#"
-use std::arch::x86_64::*;
+use core_arch::arch::x86_64::*;
 
 #[inline]
 unsafe fn _mm_loadu_ph_to___m128i(mem_addr: *const f16) -> __m128i {