[lldb][test] Add test for Swift expressions in the "memory find" command

lldb/test/API/lang/swift/command_memory_find/Makefile

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+SWIFT_SOURCES := main.swift
+
+include Makefile.rules

lldb/test/API/lang/swift/command_memory_find/TestSwiftCommandMemoryFind.py

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+"""
+Test that running Swift expressions in the
+`memory find` command works.
+"""
+import lldb
+from lldbsuite.test.lldbtest import *
+from lldbsuite.test.decorators import *
+import lldbsuite.test.lldbutil as lldbutil
+
+
+class TestSwiftCommandMemoryFind(TestBase):
+    def memory_find(self, name: str, expr: str, target):
+        var = target.FindGlobalVariables(name, 1)
+        self.assertEqual(len(var), 1)
+        addr = var[0].AddressOf()
+        self.assertTrue(addr)
+        addr = addr.GetValueAsUnsigned()
+        self.expect(f'memory find -e "{expr}" {hex(addr)} {hex(addr + 8)}',
+                    substrs=["data found at location"])
+
+    @swiftTest
+    def test(self):
+        self.build()
+        target, _, _, _ = lldbutil.run_to_source_breakpoint(
+            self, 'Break', lldb.SBFileSpec('main.swift'))
+
+        self.memory_find('elem1', 'elem1', target)
+        self.memory_find('elem1', '130 + 7', target)
+
+        self.memory_find('elem2', 'elem2', target)
+        self.memory_find('elem2', '-42', target)

lldb/test/API/lang/swift/command_memory_find/main.swift

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+let elem1: Int32 = 137
+let elem2: Int64 = -42
+print ("Break")