[AArch64][GlobalISel] Fix vector lrint/llrint fallbacks (#170814)

Add .lower() to vector lrint/llrint to enable lowering instead of
falling back to SelectionDAG.

Author: ayank227

llvm/lib/Target/AArch64/GISel/AArch64LegalizerInfo.cpp

@@ -450,13 +450,15 @@ AArch64LegalizerInfo::AArch64LegalizerInfo(const AArch64Subtarget &ST)
       .legalFor({{s32, s32}, {s32, s64}, {s64, s32}, {s64, s64}})
       .legalFor(HasFP16, {{s32, s16}, {s64, s16}})
       .minScalar(1, s32)
-      .libcallFor({{s64, s128}});
+      .libcallFor({{s64, s128}})
+      .lower();
   getActionDefinitionsBuilder({G_LLROUND, G_INTRINSIC_LLRINT})
       .legalFor({{s64, s32}, {s64, s64}})
       .legalFor(HasFP16, {{s64, s16}})
       .minScalar(0, s64)
       .minScalar(1, s32)
-      .libcallFor({{s64, s128}});
+      .libcallFor({{s64, s128}})
+      .lower();
 
   // TODO: Custom legalization for mismatched types.
   getActionDefinitionsBuilder(G_FCOPYSIGN)

llvm/test/CodeGen/AArch64/GlobalISel/legalizer-info-validation.mir

@@ -188,12 +188,12 @@
 # DEBUG-NEXT: .. the first uncovered imm index: 0, OK
 # DEBUG-NEXT: G_INTRINSIC_LRINT (opcode {{[0-9]+}}): 2 type indices, 0 imm indices
 # DEBUG-NEXT: .. opcode {{[0-9]+}} is aliased to {{[0-9]+}}
-# DEBUG-NEXT: .. the first uncovered type index: 2, OK
-# DEBUG-NEXT: .. the first uncovered imm index: 0, OK
+# DEBUG-NEXT: .. type index coverage check SKIPPED: user-defined predicate detected
+# DEBUG-NEXT: .. imm index coverage check SKIPPED: user-defined predicate detected
 # DEBUG-NEXT: G_INTRINSIC_LLRINT (opcode {{[0-9]+}}): 2 type indices, 0 imm indices
 # DEBUG-NEXT: .. opcode {{[0-9]+}} is aliased to {{[0-9]+}}
-# DEBUG-NEXT: .. the first uncovered type index: 2, OK
-# DEBUG-NEXT: .. the first uncovered imm index: 0, OK
+# DEBUG-NEXT: .. type index coverage check SKIPPED: user-defined predicate detected
+# DEBUG-NEXT: .. imm index coverage check SKIPPED: user-defined predicate detected
 # DEBUG-NEXT: G_INTRINSIC_ROUNDEVEN (opcode {{[0-9]+}}): 1 type index, 0 imm indices
 # DEBUG-NEXT: .. opcode {{[0-9]+}} is aliased to {{[0-9]+}}
 # DEBUG-NEXT: .. the first uncovered type index: 1, OK
@@ -696,11 +696,11 @@
 # DEBUG-NEXT: .. type index coverage check SKIPPED: user-defined predicate detected
 # DEBUG-NEXT: .. imm index coverage check SKIPPED: user-defined predicate detected
 # DEBUG-NEXT: G_LROUND (opcode {{[0-9]+}}): 2 type indices, 0 imm indices
-# DEBUG-NEXT: .. the first uncovered type index: 2, OK
-# DEBUG-NEXT: .. the first uncovered imm index: 0, OK
+# DEBUG-NEXT: .. type index coverage check SKIPPED: user-defined predicate detected
+# DEBUG-NEXT: .. imm index coverage check SKIPPED: user-defined predicate detected
 # DEBUG-NEXT: G_LLROUND (opcode {{[0-9]+}}): 2 type indices, 0 imm indices
-# DEBUG-NEXT: .. the first uncovered type index: 2, OK
-# DEBUG-NEXT: .. the first uncovered imm index: 0, OK
+# DEBUG-NEXT: .. type index coverage check SKIPPED: user-defined predicate detected
+# DEBUG-NEXT: .. imm index coverage check SKIPPED: user-defined predicate detected
 # DEBUG-NEXT: G_BR (opcode {{[0-9]+}}): 0 type indices, 0 imm indices
 # DEBUG-NEXT: .. type index coverage check SKIPPED: user-defined predicate detected
 # DEBUG-NEXT: .. imm index coverage check SKIPPED: user-defined predicate detected