[msan] Support most Arm NEON vector shift instructions (#102507)

This adds support for the Arm NEON vector shift instructions that follow
the same pattern as x86 (handleVectorShiftIntrinsic).

VSLI is not supported because it does not follow the 2-argument pattern
expected by handleVectorShiftIntrinsic.

This patch also updates the arm64-vshift.ll MSan test that was
introduced in
5d0a12d

Author: thurstond

llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp

@@ -4116,6 +4116,23 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
     case Intrinsic::x86_mmx_psrli_q:
     case Intrinsic::x86_mmx_psrai_w:
     case Intrinsic::x86_mmx_psrai_d:
+    case Intrinsic::aarch64_neon_rshrn:
+    case Intrinsic::aarch64_neon_sqrshl:
+    case Intrinsic::aarch64_neon_sqrshrn:
+    case Intrinsic::aarch64_neon_sqrshrun:
+    case Intrinsic::aarch64_neon_sqshl:
+    case Intrinsic::aarch64_neon_sqshlu:
+    case Intrinsic::aarch64_neon_sqshrn:
+    case Intrinsic::aarch64_neon_sqshrun:
+    case Intrinsic::aarch64_neon_srshl:
+    case Intrinsic::aarch64_neon_sshl:
+    case Intrinsic::aarch64_neon_uqrshl:
+    case Intrinsic::aarch64_neon_uqrshrn:
+    case Intrinsic::aarch64_neon_uqshl:
+    case Intrinsic::aarch64_neon_uqshrn:
+    case Intrinsic::aarch64_neon_urshl:
+    case Intrinsic::aarch64_neon_ushl:
+      // Not handled here: aarch64_neon_vsli (vector shift left and insert)
       handleVectorShiftIntrinsic(I, /* Variable */ false);
       break;
     case Intrinsic::x86_avx2_psllv_d: