[AArch64] Enable svcompact intrinsic in streaming mode with SME2.2 (llvm#151703)

When the target enables +sme2p2, the svcompact intrinsic is now
available in streaming SVE mode, through updating the guards in
arm_sve.td. Included Sema test acle_sve_compact.cpp.

Author: Amichaxx

clang/include/clang/Basic/arm_sve.td

@@ -980,8 +980,8 @@ defm SVCLASTA_N : SVEPerm<"svclasta[_n_{d}]", "sPsd", "aarch64_sve_clasta_n">;
 defm SVCLASTB   : SVEPerm<"svclastb[_{d}]",   "dPdd", "aarch64_sve_clastb">;
 defm SVCLASTB_N : SVEPerm<"svclastb[_n_{d}]", "sPsd", "aarch64_sve_clastb_n">;
 
-let SVETargetGuard = "sve", SMETargetGuard = InvalidMode in {
-def SVCOMPACT : SInst<"svcompact[_{d}]",   "dPd",  "ilUiUlfd", MergeNone, "aarch64_sve_compact">;
+let SVETargetGuard = "sve", SMETargetGuard = "sme2p2" in {
+def SVCOMPACT    : SInst<"svcompact[_{d}]",   "dPd",  "ilUiUlfd", MergeNone, "aarch64_sve_compact", [VerifyRuntimeMode]>;
 }
 
 // Note: svdup_lane is implemented using the intrinsic for TBL to represent a

clang/test/Sema/aarch64-sve-intrinsics/acle_sve_compact.cpp

@@ -0,0 +1,18 @@
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sve \
+// RUN: -verify -verify-ignore-unexpected=error,note -emit-llvm -o - %s
+// RUN: %clang_cc1 -triple aarch64-none-linux-gnu -target-feature +sme \
+// RUN: -verify -verify-ignore-unexpected=error,note -emit-llvm -o - %s
+// REQUIRES: aarch64-registered-target
+// expected-no-diagnostics
+
+#include <arm_sve.h>
+
+__attribute__((target("sme2p2")))
+void test_svcompact(svbool_t pg, svfloat32_t op) __arm_streaming{
+  svcompact(pg, op);
+}
+
+void test_svcompact_nofeature(svbool_t pg, svfloat32_t op) __arm_streaming{
+  // expected-error@+1 {{'svcompact' needs target feature (sve)|(sme, sme2p2)}}
+  svcompact(pg, op);
+}