Imported Upstream version 6.4.0.137

Former-commit-id: 943baa9f16a098c33e129777827f3a9d20da00d6

external/llvm/test/CodeGen/AArch64/falkor-hwpf-fix.mir

@@ -353,3 +353,28 @@ body: |
   bb.1:
     RET_ReallyLR
 ...
+---
+# Check that non-base registers are considered live when finding a
+# scratch register by making sure we don't use %x2 for the scratch
+# register for the inserted ORRXrs.
+# CHECK-LABEL: name: hwpf_offreg
+# CHECK: %x3 = ORRXrs %xzr, %x1, 0
+# CHECK: %w10 = LDRWroX %x3, %x2, 0, 0
+name:            hwpf_offreg
+tracksRegLiveness: true
+body: |
+  bb.0:
+    liveins: %w0, %x1, %x2, %x17, %x18
+
+    %w10 = LDRWroX %x1, %x2, 0, 0 :: ("aarch64-strided-access" load 4)
+
+    %x2 = ORRXrs %xzr, %x10, 0
+    %w26 = LDRWroX %x1, %x2, 0, 0
+
+    %w0 = SUBWri %w0, 1, 0
+    %wzr = SUBSWri %w0, 0, 0, implicit-def %nzcv
+    Bcc 9, %bb.0, implicit %nzcv
+
+  bb.1:
+    RET_ReallyLR
+...