[lldb] [gdb-remote] Recognize aarch64v type from gdbserver

[labath]

I'm guessing this is what's being sent by gdbserver.

lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp

feature_node.ForEachChildElementWithName(
             reg_info.format = eFormatHex;
             reg_info.encoding = eEncodingUint;
           } else if (gdb_type == "data_ptr" || gdb_type == "code_ptr") {
             reg_info.format = eFormatAddressInfo;
             reg_info.encoding = eEncodingUint;
           } else if (gdb_type == "i387_ext" || gdb_type == "float") {
             reg_info.format = eFormatFloat;
             reg_info.encoding = eEncodingIEEE754;
+          } else if (gdb_type == "aarch64v") {
+            reg_info.format = eFormatVectorOfUInt8;
+            reg_info.encoding = eEncodingVector;
           }
         }
 
         // Only update the register set name if we didn't get a "reg_set"
         // attribute. "set_name" will be empty if we didn't have a "reg_set"
         // attribute.
         if (!set_name) {
           if (!gdb_group.empty()) {

lldb/test/API/functionalities/gdb_remote_client/TestGDBServerTargetXML.py

def test_aarch64_regs(self):
         self.match("register read fp",
                    ["x29 = 0x3837363534333231"])
         self.match("register read lr",
                    ["x30 = 0x4847464544434241"])
         self.match("register read ra",
                    ["x30 = 0x4847464544434241"])
         self.match("register read flags",
                    ["cpsr = 0x74737271"])
+
+        # test vector registers
+        self.match("register read v0",
+                   ["v0 = {0x81 0x82 0x83 0x84 0x85 0x86 0x87 0x88 0x89 0x8a 0x8b 0x8c 0x8d 0x8e 0x8f 0x90}"])
+        self.match("register read v31",
+                   ["v31 = {0xa1 0xa2 0xa3 0xa4 0xa5 0xa6 0xa7 0xa8 0xa9 0xaa 0xab 0xac 0xad 0xae 0xaf 0xb0}"])